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December 1, 2021 12:39
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Sega MegaDrive development kit debugger
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| ****************************************** | |
| *SEGA Megadrive comunication program * | |
| *(c) 1991 Synchron Assembly * | |
| *https://www.tn-data.se * | |
| ****************************************** | |
| *f1=trace, f2=skip instruction f4=go | |
| *d xxxx set dissasm window, d pc | |
| *m xxxx set memory window, m pc | |
| *j xxxx set sega PC | |
| *bs xxxx set breakpoint | |
| *br xxxx remove breakpoint | |
| *f xx fill Sega rom memory with xx | |
| *t busrt send game from ST to SEGA | |
| *q quit | |
| *l name load a sega file to adr 0 | |
| *dir | |
| ****************************************** | |
| max_breakptr: equ 8 | |
| diss: | |
| *Packets sendt from Sega to ST | |
| *Header 'D' ($44) | |
| *1: berr | |
| *2: adrerror | |
| *3: illegal | |
| *4: zero | |
| *5: chk | |
| *6: trapv | |
| *7: priv | |
| *8: line-a | |
| *9: line-f | |
| *10:All registers, D0-D7/A0-A7,PC,SR | |
| *11:12 bytes data som varje adressregister pekar p† i Segan, f”r reg displayen | |
| *12:SEGA IRQ level 2 msg | |
| *Header 'S' | |
| *1: Continue exection | |
| *2: Burstsend data from SRAM to ST | |
| *3: Burst Send data from Z80 to ST | |
| start move.l 4(A7),a0 | |
| move.l a0,basepage | |
| move.l $18(a0),a1 | |
| add.l $1c(a0),a1 | |
| adda.l #$4000,a1 | |
| move.l a1,sp | |
| sub.l basepage,a1 | |
| move.l a1,-(a7) | |
| move.l basepage,-(a7) | |
| clr.w -(a7) | |
| move.w #$4a,-(A7) | |
| trap #1 | |
| add.l #12,a7 | |
| tst.l d0 | |
| bsr init | |
| bsr init_display | |
| bsr reset_megadrive | |
| tst.w d0 | |
| beq.s .c0 *Reset ok? | |
| illegal | |
| .c0: | |
| bsr boot_sega | |
| bsr update_display | |
| bsr get_diswin_data | |
| bsr update_dis_window | |
| bsr get_memwin_data | |
| bsr update_mem_window | |
| *Wait for Dbug commands | |
| main_loop: | |
| bsr check_sega | |
| tst.w d0 | |
| beq.s main_loop | |
| bsr check_keyboard | |
| tst.w d0 | |
| bmi.s .ex | |
| cmp.w #2,d0 | |
| bne.s .c0 | |
| bsr check_command | |
| tst.w d0 | |
| bmi.s .ex | |
| bne.s main_loop | |
| .c0: | |
| bra.s main_loop | |
| .ex: illegal | |
| **************************************************** | |
| check_command: | |
| *Ask for the start adress of the window | |
| move.l last_key(pc),d0 | |
| beq.s .x | |
| st lastkey_flag | |
| moveq #39,d0 | |
| lea rad,a0 | |
| move.w #0,cx | |
| move.w #24,cy | |
| bsr input_line | |
| tst.w d0 | |
| bne.s .x | |
| bsr process_command | |
| .x: | |
| rts | |
| even | |
| rts | |
| **************************************************** | |
| *Kolla tangentbord om n†gon tangent „r nertryckt | |
| check_keyboard: | |
| move.w #$b,-(a7) | |
| trap #1 | |
| addq.w #2,a7 | |
| tst.w d0 | |
| beq.s .nokey | |
| bsr get_key | |
| cmp.b #$1b,d0 | |
| beq.s .quit | |
| swap d0 | |
| lea gem_kbdtab(pc),a0 | |
| .l1: move.w (a0)+,d1 | |
| bmi.s .nofound | |
| cmp.w d0,d1 | |
| beq.s .found | |
| addq.w #6,a0 | |
| bra.s .l1 | |
| .found: | |
| tst.w (a0)+ | |
| beq.s .c0 | |
| tst.b monitor_flag | |
| bne.s .c0 | |
| moveq #0,d0 | |
| rts | |
| .c0: | |
| move.l (a0),a0 | |
| jmp (a0) | |
| .nofound: | |
| moveq #2,d0 | |
| rts | |
| .nokey: moveq #1,d0 | |
| rts | |
| .quit: moveq #-1,d0 | |
| rts | |
| gem_kbdtab: | |
| *Keycode, -1=only accessable while in Sega-bug, 0=don't care | |
| dc.w $48,0 | |
| dc.l curs_up | |
| dc.w $50,0 | |
| dc.l curs_down | |
| dc.w $4b,0 | |
| dc.l curs_left | |
| dc.w $4d,0 | |
| dc.l curs_right | |
| dc.w $3b,-1 | |
| dc.l sega_trace | |
| dc.w $3c,-1 | |
| dc.l sega_skip | |
| dc.w $3d,-1 | |
| dc.l sega_gobreak | |
| dc.w $3e,-1 | |
| dc.l sega_go | |
| dc.w $f,0 | |
| dc.l change_window | |
| dc.l -1,-1 | |
| .quit: moveq #-1,d0 | |
| rts | |
| curs_up: | |
| move.w aktiv_window(pc),d0 | |
| add.w d0,d0 | |
| add.w d0,d0 | |
| move.l .tab(pc,d0.w),a0 | |
| jmp (a0) | |
| .tab: dc.l memwin_up,diswin_down | |
| curs_down: | |
| move.w aktiv_window(pc),d0 | |
| add.w d0,d0 | |
| add.w d0,d0 | |
| move.l .tab(pc,d0.w),a0 | |
| jmp (a0) | |
| .tab: dc.l memwin_down,diswin_up | |
| curs_left: | |
| move.w aktiv_window(pc),d0 | |
| add.w d0,d0 | |
| add.w d0,d0 | |
| move.l .tab(pc,d0.w),a0 | |
| jmp (a0) | |
| .tab: dc.l memwin_left,diswin_down | |
| curs_right: | |
| move.w aktiv_window(pc),d0 | |
| add.w d0,d0 | |
| add.w d0,d0 | |
| move.l .tab(pc,d0.w),a0 | |
| jmp (a0) | |
| .tab: dc.l memwin_right,diswin_up | |
| diswin_up: | |
| move.l disrowsize,d0 | |
| btst.b #1,shift_flag | |
| beq.s .nos | |
| move.l disrowsize+40,d0 | |
| .nos: move.l d0,diswin_ptr | |
| bsr get_diswin_data | |
| bsr update_dis_window | |
| moveq #0,d0 | |
| rts | |
| diswin_down: | |
| sub.l #2,diswin_ptr | |
| bsr get_diswin_data | |
| bsr update_dis_window | |
| moveq #0,d0 | |
| rts | |
| memwin_left: | |
| subq.l #1,memwin_ptr | |
| bsr get_memwin_data | |
| bsr update_mem_window | |
| moveq #0,d0 | |
| rts | |
| memwin_right: | |
| addq.l #1,memwin_ptr | |
| bsr get_memwin_data | |
| bsr update_mem_window | |
| moveq #0,d0 | |
| rts | |
| memwin_up: | |
| moveq #4,d0 *shift | |
| btst.b #1,shift_flag | |
| beq.s .nos | |
| moveq #48,d0 | |
| .nos: sub.l d0,memwin_ptr | |
| bsr get_memwin_data | |
| bsr update_mem_window | |
| moveq #0,d0 | |
| rts | |
| memwin_down: | |
| moveq #4,d0 *shift | |
| btst.b #1,shift_flag | |
| beq.s .nos | |
| moveq #48,d0 | |
| .nos: add.l d0,memwin_ptr | |
| bsr get_memwin_data | |
| bsr update_mem_window | |
| moveq #0,d0 | |
| rts | |
| **************************************************** | |
| *Single step all instructions including jcc,bsr | |
| sega_gobreak: | |
| moveq #"S",d0 *Sega SRAM | |
| bsr send_byte | |
| moveq #2,d0 | |
| bsr send_byte | |
| move.l sega_pc(pc),a0 | |
| lea temp(pc),a1 | |
| moveq #12,d0 | |
| bsr burst_recieve | |
| .x: moveq #0,d0 | |
| moveq #20,d0 | |
| bsr print_msg | |
| move.l #0,obj_start | |
| move.l #0,base_page | |
| move.l #temp,dis_adr | |
| move.l #temp+12,dis_ptr | |
| move.l a6,-(a7) | |
| jsr dis | |
| move.l (a7)+,a6 | |
| sub.l #temp,a0 | |
| move.l a0,d0 | |
| add.l sega_pc(pc),d0 | |
| move.l d0,a0 | |
| moveq #2,d0 | |
| bsr add_break | |
| bsr sega_go | |
| * moveq #"S",d0 *GO | |
| * bsr send_byte | |
| * moveq #1,d0 | |
| * bsr send_byte | |
| moveq #0,d0 | |
| rts | |
| **************************************************** | |
| get_diswin_data: | |
| move.w diswin_typ(pc),d0 | |
| add.w d0,d0 | |
| add.w d0,d0 | |
| move.l .tab(pc,d0.w),a0 | |
| jmp (a0) | |
| .tab: dc.l .sram,.stram | |
| .sram: | |
| tst.b monitor_flag | |
| beq.s .x | |
| moveq #"S",d0 *Sega SRAM | |
| bsr send_byte | |
| moveq #2,d0 | |
| bsr send_byte | |
| lea diswin_buf(pc),a1 | |
| move.l diswin_ptr(pc),d0 | |
| tst.l d0 | |
| bmi.s .er | |
| cmp.l #$400000-48,d0 *Rom? | |
| blt.s .c0 | |
| cmp.l #$ff0000,d0 | |
| blt.s .er | |
| cmp.l #$ffffff-48,d0 | |
| bls.s .c0 | |
| .er: moveq #0,d0 | |
| .c0: | |
| move.l d0,diswin_ptr | |
| move.l diswin_ptr(pc),a0 | |
| moveq #48,d0 | |
| bsr burst_recieve | |
| moveq #0,d0 | |
| rts | |
| .stram: | |
| lea diswin_buf(pc),a1 | |
| move.l diswin_ptr(pc),d0 | |
| tst.l d0 | |
| bpl.s .c9 | |
| moveq #0,d0 | |
| .c9: cmp.l #$3fffc0,d0 | |
| bls.s .c1 | |
| move.l #$3fffc0,d0 | |
| .c1: move.l d0,a0 | |
| move.l d0,diswin_ptr | |
| moveq #48,d0 | |
| .l1: move.b (a0)+,(a1)+ | |
| dbra d0,.l1 | |
| .x: moveq #0,d0 | |
| rts | |
| **************************************************** | |
| *transfere the correct memwin data in to memwin_buf | |
| get_memwin_data: | |
| move.w memwin_typ(pc),d0 | |
| add.w d0,d0 | |
| add.w d0,d0 | |
| move.l .tab(pc,d0.w),a0 | |
| jmp (a0) | |
| .tab: dc.l .sram,.stram,.z80,.vram | |
| .sram: | |
| tst.b monitor_flag | |
| beq .x | |
| moveq #"S",d0 *Sega SRAM | |
| bsr send_byte | |
| moveq #2,d0 | |
| bsr send_byte | |
| lea memwin_buf(pc),a1 | |
| move.l memwin_ptr(pc),d0 | |
| tst.l d0 | |
| bmi.s .er | |
| cmp.l #$400000,d0 *Rom? | |
| blt.s .c0 | |
| cmp.l #$ff0000,d0 | |
| blt.s .er | |
| cmp.l #$ffffff-48,d0 | |
| bls.s .c0 | |
| .er: moveq #0,d0 | |
| .c0: | |
| move.l d0,memwin_ptr | |
| move.l d0,a0 | |
| moveq #48,d0 | |
| bsr burst_recieve | |
| moveq #0,d0 | |
| rts | |
| .stram: | |
| lea memwin_buf(pc),a1 | |
| move.l memwin_ptr(pc),d0 | |
| tst.l d0 | |
| bpl.s .c9 | |
| moveq #0,d0 | |
| .c9: cmp.l #$3fffc0,d0 | |
| bls.s .c1 | |
| move.l #$3fffc0,d0 | |
| .c1: move.l d0,a0 | |
| move.l d0,memwin_ptr | |
| moveq #48,d0 | |
| .l1: move.b (a0)+,(a1)+ | |
| dbra d0,.l1 | |
| moveq #0,d0 | |
| rts | |
| .z80: | |
| tst.b monitor_flag | |
| beq.s .x | |
| move.l memwin_ptr(pc),d0 | |
| tst.l d0 | |
| bpl.s .c2 | |
| moveq #0,d0 | |
| .c2: cmp.l #$7ec0,d0 | |
| bls.s .c3 | |
| move.l #$7ec0,d0 | |
| .c3: move.l d0,memwin_ptr | |
| moveq #"S",d0 *Sega Z80 | |
| bsr send_byte | |
| moveq #8,d0 | |
| bsr send_byte | |
| lea memwin_buf(pc),a1 | |
| move.l memwin_ptr(pc),a0 | |
| add.l #$a00000,a0 | |
| moveq #48,d0 | |
| bsr burst_recieve | |
| .x: moveq #0,d0 | |
| rts | |
| .vram: | |
| tst.b monitor_flag | |
| beq.s .x | |
| moveq #"S",d0 *Sega Z80 | |
| bsr send_byte | |
| moveq #9,d0 | |
| bsr send_byte | |
| move.l memwin_ptr(pc),d0 | |
| tst.l d0 | |
| bpl.s .c7 | |
| moveq #0,d0 | |
| .c7: cmp.l #$ffd4,d0 | |
| bls.s .c8 | |
| move.l #$ffd4,d0 | |
| .c8: move.l d0,memwin_ptr | |
| move.l d0,a0 | |
| lea memwin_buf(pc),a1 | |
| moveq #48,d0 | |
| bsr burst_recieve | |
| move.w #37,-(a7) | |
| trap #14 | |
| addq.w #2,a7 | |
| moveq #0,d0 | |
| rts | |
| **************************************************** | |
| *TAB = change current aktiv window | |
| *TAB + shift = change current window type | |
| change_window: | |
| btst #1,shift_flag | |
| bne.s .sh | |
| *Byt aktivt f”nster | |
| addq.w #1,aktiv_window | |
| cmp.w #2,aktiv_window | |
| blt.s .c0 | |
| clr.w aktiv_window | |
| .c0: | |
| bsr update_win_header | |
| rts | |
| .sh: *Hit om shift+tab | |
| move.w aktiv_window(pc),d0 | |
| add.w d0,d0 | |
| add.w d0,d0 | |
| move.l .tab(pc,d0.w),a0 | |
| jmp (a0) | |
| .tab: dc.l .memwin,.diswin | |
| .memwin: | |
| lea memwin_ptrtab(pc),a0 | |
| move.w memwin_typ(pc),d0 | |
| add.w d0,d0 | |
| add.w d0,d0 | |
| move.l memwin_ptr(pc),(a0,d0.w) | |
| addq.w #1,memwin_typ | |
| cmp.w #4,memwin_typ | |
| blt.s .c1 | |
| clr.w memwin_typ | |
| .c1: | |
| move.w memwin_typ(pc),d0 | |
| add.w d0,d0 | |
| add.w d0,d0 | |
| move.l (a0,d0.w),memwin_ptr | |
| bsr update_win_header | |
| bsr get_memwin_data | |
| bsr update_mem_window | |
| moveq #0,d0 | |
| rts | |
| .diswin: | |
| lea diswin_ptrtab(pc),a0 | |
| move.w diswin_typ(pc),d0 | |
| add.w d0,d0 | |
| add.w d0,d0 | |
| move.l diswin_ptr(pc),(a0,d0.w) | |
| addq.w #1,diswin_typ | |
| cmp.w #2,diswin_typ | |
| blt.s .c2 | |
| clr.w diswin_typ | |
| .c2: | |
| move.w diswin_typ(pc),d0 | |
| add.w d0,d0 | |
| add.w d0,d0 | |
| move.l (a0,d0.w),diswin_ptr | |
| bsr update_win_header | |
| bsr get_diswin_data | |
| bsr update_dis_window | |
| moveq #0,d0 | |
| rts | |
| memwin_ptrtab: dc.l $100,$200,$300,$400 | |
| diswin_ptrtab: dc.l 0,$100 | |
| **************************************************** | |
| *Trace a single command on Sega | |
| sega_go: | |
| tst.w diswin_typ | |
| bne.s .xx | |
| moveq #"S",d0 | |
| bsr send_byte | |
| moveq #1,d0 | |
| bsr send_byte | |
| sf monitor_flag | |
| moveq #17,d0 | |
| bsr print_msg | |
| .xx: moveq #0,d0 | |
| rts | |
| **************************************************** | |
| *Ta bort breakpoint i Megadriven | |
| *a0=adr of breakpoint to remove | |
| remove_breakpoint: | |
| move.l a0,a3 | |
| lea breakptr_table(pc),a1 | |
| move.l a1,a2 | |
| moveq #max_breakptr-1,d7 | |
| .lop: cmp.l 4(a1),a0 | |
| beq.s .f0 | |
| addq.w #8,a1 | |
| dbra d7,.lop | |
| bra.s .x | |
| .f0: clr.l (a1) | |
| clr.l 4(a1) | |
| move.l a1,d3 | |
| sub.l a2,d3 | |
| lsr.w #3,d3 | |
| moveq #"S",d0 | |
| bsr send_byte | |
| moveq #10,d0 | |
| bsr send_byte | |
| move.w d3,d0 | |
| bsr send_byte | |
| .x: moveq #0,d0 | |
| rts | |
| **************************************************** | |
| *a0=adr in SEGA to breakpoint | |
| *d0=breakpoint typ | |
| *0:ingen breakpoint | |
| *1:permanent breakpoint | |
| *2:break once breakpoint | |
| *returns: d0> 0 breakpoint nr in table | |
| * d0=-1 om f”r m†nga breakpoints | |
| *add a breakpoint to the list and set it | |
| add_break: | |
| move.l a0,a3 *adr | |
| move.w d0,d4 *typ | |
| lea breakptr_table(pc),a0 | |
| move.l a0,a1 | |
| moveq #max_breakptr-1,d7 | |
| .lop: tst.w (a0) | |
| beq.s .c0 | |
| addq.w #8,a0 | |
| dbra d7,.lop | |
| bra.s .er | |
| .c0: *Add breakpoint in table | |
| move.l a0,d3 | |
| sub.l a1,d3 | |
| lsr.w #3,d3 | |
| move.w d4,(a0)+ | |
| move.l a0,a4 | |
| clr.w (a0)+ | |
| move.l a3,(a0)+ | |
| moveq #"S",d0 | |
| bsr send_byte | |
| moveq #7,d0 | |
| bsr send_byte | |
| move.l a3,d2 *send breakpoint adress | |
| rept 4 | |
| move.b d2,d0 | |
| lsr.l #8,d2 | |
| bsr send_byte | |
| endr | |
| move.w d3,d0 | |
| bsr send_byte *send break nummer | |
| move.w d4,d0 | |
| bsr send_byte *send break typ | |
| move.w d3,d0 | |
| bsr recieve_byte1 | |
| move.b d0,(a4)+ | |
| bsr recieve_byte1 | |
| move.b d0,(a4)+ | |
| rts | |
| .er: moveq #-1,d0 | |
| rts | |
| breakptr_table: *format 1w typ, 1w old data, 1L adress | |
| ds.l max_breakptr*2 | |
| **************************************************** | |
| *skip current instruction | |
| sega_skip: | |
| tst.w diswin_typ | |
| bne .xx | |
| moveq #"S",d0 *Sega SRAM | |
| bsr send_byte | |
| moveq #2,d0 | |
| bsr send_byte | |
| move.l sega_pc(pc),a0 | |
| lea temp(pc),a1 | |
| moveq #12,d0 | |
| bsr burst_recieve | |
| .x: moveq #0,d0 | |
| moveq #19,d0 | |
| bsr print_msg | |
| move.l #0,obj_start | |
| move.l #0,base_page | |
| move.l #temp,dis_adr | |
| move.l #temp+12,dis_ptr | |
| move.l a6,-(a7) | |
| jsr dis | |
| move.l (a7)+,a6 | |
| sub.l #temp,a0 | |
| move.l a0,d0 | |
| add.l d0,sega_pc | |
| moveq #"S",d0 *jump/set pc | |
| bsr send_byte | |
| moveq #6,d0 | |
| bsr send_byte | |
| move.l sega_pc(pc),d2 *send adress | |
| rept 4 | |
| move.b d2,d0 | |
| lsr.l #8,d2 | |
| bsr send_byte | |
| endr | |
| bsr update_dis_window | |
| bsr update_reg_window | |
| .xx: moveq #0,d0 | |
| rts | |
| **************************************************** | |
| *Trace a single command on Sega | |
| sega_trace: | |
| tst.w diswin_typ | |
| bne.s .xx | |
| tst.b trace_flag | |
| beq.s .c0 | |
| rts | |
| .c0: moveq #"S",d0 | |
| bsr send_byte | |
| moveq #3,d0 | |
| bsr send_byte | |
| moveq #15,d0 | |
| bsr print_msg | |
| st trace_flag | |
| .xx: moveq #0,d0 | |
| rts | |
| **************************************************** | |
| *Updatera all f”nstren | |
| update_display: | |
| lea window_tab,a0 | |
| bsr draw_all_windows | |
| bsr update_win_header | |
| bsr update_reg_window | |
| bsr update_mem_window | |
| bsr update_dis_window | |
| rts | |
| **************************************************** | |
| *Prints out the current name of window: | |
| update_win_header: | |
| move.w #54,cx | |
| move.w #22,cy | |
| st font_size | |
| sf inv_flag | |
| cmp.w #0,aktiv_window | |
| bne.s .c0 | |
| st inv_flag | |
| .c0: | |
| move.w memwin_typ(pc),d0 | |
| add.w d0,d0 | |
| add.w d0,d0 | |
| move.l .tab1(pc,d0.w),a0 | |
| bsr print_line | |
| sf inv_flag | |
| move.w #1,cx | |
| move.w #22,cy | |
| cmp.w #1,aktiv_window | |
| bne.s .c1 | |
| st inv_flag | |
| .c1: | |
| move.w diswin_typ(pc),d0 | |
| add.w d0,d0 | |
| add.w d0,d0 | |
| move.l .tab1(pc,d0.w),a0 | |
| bsr print_line | |
| sf inv_flag | |
| sf font_size | |
| rts | |
| .tab1: dc.l .a,.bb,.c,.d | |
| .tab2: dc.l .e,.f,.g | |
| .a: dc.b "Memory SEGA",0 | |
| .bb: dc.b "Memory ST ",0 | |
| .c: dc.b "Memory Z80 ",0 | |
| .d: dc.b "Memory VRAM",0 | |
| .e: dc.b "Dissasembly ST ",0 | |
| .f: dc.b "Dissasembly SEGA",0 | |
| .g: dc.b "Dissasembly Z80 ",0 | |
| even | |
| **************************************************** | |
| get_key: | |
| move.w #7,-(a7) | |
| trap #1 | |
| addq.w #2,a7 | |
| move.l d0,last_key | |
| move #-1,-(a7) | |
| move #11,-(a7) | |
| trap #13 | |
| addq.l #4,a7 | |
| move.b d0,shift_flag | |
| move.l last_key(pc),d0 | |
| rts | |
| **************************************************** | |
| *Input a line | |
| *returns d0=0 om ok, d0=1 om no line entered | |
| *a0=adr of dest buffer | |
| *d0=max size of buffer | |
| input_line: | |
| move.l a0,a5 | |
| move.w d0,d6 | |
| *Clear input line | |
| move.l phys(pc),a0 | |
| add.w cx(pc),a0 | |
| move.w cy,d1 | |
| mulu #80*16,d1 | |
| add.w d1,a0 | |
| moveq #0,d1 | |
| .lop1: | |
| temp1: set 0 | |
| rept 16 | |
| move.b d1,temp1(a0) | |
| temp1: set temp1+80 | |
| endr | |
| addq.w #1,a0 | |
| dbra d0,.lop1 | |
| moveq #0,d7 *Xpos | |
| .lop | |
| tst.b lastkey_flag | |
| beq.s .no | |
| sf lastkey_flag | |
| move.l last_key(pc),d0 | |
| bra.s .c1 | |
| .no: move.w #7,-(a7) | |
| trap #1 | |
| addq.w #2,a7 | |
| .c1: | |
| cmp. #$1b,d0 | |
| beq .esc | |
| swap d0 | |
| cmp.w #$1c,d0 | |
| beq.s .ret | |
| cmp.w #$53,d0 *delete | |
| beq.s .lop | |
| cmp.w #$e,d0 | |
| beq.s .backspace | |
| swap d0 | |
| cmp.w d6,d7 | |
| bhs.s .lop | |
| addq.w #1,d7 | |
| move.b d0,char | |
| move.b d0,(a5)+ | |
| bsr print_char | |
| move.b #" ",char | |
| st inv_flag | |
| bsr print_char | |
| sf inv_flag | |
| subq.w #1,cx | |
| bra .lop | |
| .backspace: | |
| tst.w d7 | |
| beq.s .lop | |
| subq.w #1,d7 | |
| subq.w #1,cx | |
| st inv_flag | |
| move.b #" ",char | |
| bsr print_char | |
| sf inv_flag | |
| bsr print_char | |
| clr.b -(a5) | |
| subq.w #2,cx | |
| bra .lop | |
| .ret: | |
| move.b #" ",char | |
| bsr print_char | |
| clr.b (a5) | |
| tst.w d7 | |
| beq.s .esc | |
| moveq #0,d0 | |
| rts | |
| .esc: moveq #1,d0 | |
| clr.b (a5) | |
| rts | |
| **************************************************** | |
| *1 =no header | |
| *-1=error | |
| *0 =header crunched ok | |
| check_sega: *Check for data from Sega | |
| move.w $fb0000,d0 | |
| btst #8,d0 | |
| beq.s .no | |
| bsr recieve_byte1 | |
| cmp.b #"D",d0 | |
| bne.s .er | |
| bsr recieve_byte1 | |
| and.w #$ff,d0 | |
| cmp.w #20,d0 | |
| bhs.s .er | |
| add.w d0,d0 | |
| add.w d0,d0 | |
| move.l .tab2(pc,d0.w),a0 | |
| jmp (a0) | |
| .no: moveq #1,d0 | |
| rts | |
| .er: cmp.b #"S",d0 | |
| beq.s .no | |
| illegal | |
| moveq #-1,d0 | |
| illegal | |
| .tab2: dc.l .er,.berr,.adrerr,.ill,.zero,.chk | |
| dc.l .trapv,.priv,.linea,.linef,.allregs | |
| dc.l .sega_axdata,.irq,.trace | |
| .berr: moveq #4,d0 | |
| bsr print_msg | |
| bra .exit | |
| .adrerr:moveq #5,d0 | |
| bsr print_msg | |
| bra .exit | |
| .ill: moveq #6,d0 | |
| st monitor_flag ********* | |
| bsr print_msg | |
| *Kolla om illegalen „r en breakpoint | |
| lea breakptr_table(pc),a0 | |
| moveq #max_breakptr-1,d0 | |
| move.l sega_pc(pc),a1 | |
| .la: cmp.l 4(a0),a1 | |
| beq.s .f | |
| addq.w #8,a0 | |
| dbra d0,.la | |
| bra .c0 | |
| .f: cmp.w #2,(a0) | |
| beq.s .brk2 | |
| bra .c0 | |
| .brk2: *1g†ngs breakpoint, „r utf”rd och ta d† bort den | |
| clr.l (a0)+ | |
| clr.l (a0) | |
| .c0: bra .exit | |
| .zero: moveq #7,d0 | |
| bsr print_msg | |
| bra .exit | |
| .chk: moveq #8,d0 | |
| bsr print_msg | |
| bra .exit | |
| .trapv: moveq #9,d0 | |
| bsr print_msg | |
| bra .exit | |
| .priv: moveq #10,d0 | |
| bsr print_msg | |
| bra .exit | |
| .linea: moveq #11,d0 | |
| bsr print_msg | |
| bra .exit | |
| .linef: moveq #12,d0 | |
| bsr print_msg | |
| bra .exit | |
| .irq: moveq #13,d0 | |
| bsr print_msg | |
| st monitor_flag | |
| bra .exit | |
| .trace: moveq #16,d0 | |
| st monitor_flag | |
| bsr print_msg | |
| bra .exit | |
| .allregs: | |
| moveq #15,d3 | |
| lea sega_regs(pc),a1 | |
| .lop1: | |
| rept 4 | |
| bsr recieve_byte1 | |
| move.b d0,(a1)+ | |
| endr | |
| dbra d3,.lop1 | |
| lea sega_pc(pc),a2 | |
| rept 4 | |
| bsr recieve_byte1 | |
| move.b d0,(a2)+ | |
| endr | |
| lea sega_sr(pc),a2 | |
| rept 2 | |
| bsr recieve_byte1 | |
| move.b d0,(a2)+ | |
| endr | |
| bsr update_reg_window *Dis win scroll | |
| move.l sega_pc(pc),d0 | |
| cmp.l last_start(pc),d0 | |
| blt.s .y | |
| cmp.l last_slut(pc),d0 | |
| bls.s .xx | |
| .y: move.l d0,diswin_ptr | |
| .xx: | |
| bsr get_diswin_data | |
| bsr update_dis_window | |
| .exit: moveq #0,d0 | |
| rts | |
| *Recieve 12bytes f”r varje Ax register | |
| .sega_axdata: | |
| lea sega_axdata(pc),a1 | |
| moveq #7,d3 | |
| .sax1: | |
| rept 12 | |
| bsr recieve_byte1 | |
| move.b d0,(a1)+ | |
| endr | |
| dbra d3,.sax1 | |
| rts | |
| even | |
| ************************************************** | |
| *a0=start adr in SEGA | |
| *d0=antal bytes to recieve | |
| *a1=dest adr in ST | |
| burst_recieve: | |
| move.l d0,d4 | |
| move.l a1,a3 | |
| lea .temp(pc),a2 | |
| move.l a0,(a2) | |
| rept 4 | |
| move.b (a2)+,d0 *send start adr in SEGA | |
| bsr send_byte | |
| endr | |
| lea .temp(pc),a2 | |
| move.l d4,(a2) | |
| rept 4 | |
| move.b (a2)+,d0 *send start adr in SEGA | |
| bsr send_byte | |
| endr | |
| *Do the transfere | |
| lea $fb0000,a4 | |
| moveq #0,d3 | |
| moveq #8,d6 | |
| move.w #$200,d5 | |
| tst.w 100(a6) *clear ack | |
| .lop: | |
| .no: btst d6,(a4) *wait for strobe set | |
| beq.s .no | |
| move.w (a4),d0 | |
| add.b d0,d3 | |
| move.b d0,(a3)+ | |
| tst.w 100(a6,d5.w) *set ack | |
| .no1: btst d6,(a4) *wait for strobe set | |
| bne.s .no1 | |
| move.w (a4),d0 | |
| add.b d0,d3 | |
| move.b d0,(a3)+ | |
| tst.w 100(a6) *clear ack | |
| subq.l #2,d4 | |
| bpl.s .lop | |
| bsr recieve_byte | |
| cmp.w d3,d0 | |
| beq.s .ok | |
| moveq #-1,d0 | |
| rts | |
| .ok: moveq #0,d0 | |
| rts | |
| .temp: dc.l 0 | |
| ************************************************** | |
| update_dis_window: | |
| move.w cx,save_cx | |
| move.w cy,save_cy | |
| move.w #12,cy | |
| move.l a6,-(A7) | |
| lea disrowsize(pc),a3 | |
| move.l diswin_ptr(pc),a4 | |
| lea diswin_buf(pc),a5 | |
| moveq #10,d6 | |
| move.l a5,obj_start | |
| .nxtrad: | |
| lea .temp(pc),a0 | |
| move.l #" ",8(a0) | |
| move.l #" ",12(a0) | |
| move.l #" ",16(a0) | |
| move.l #" ",20(a0) | |
| move.l #" ",24(a0) | |
| move.l #" ",28(a0) | |
| move.l #" ",32(a0) | |
| move.l #" ",36(a0) | |
| move.l #" ",40(a0) | |
| clr.w 44(a0) | |
| lea 8(a0),a6 | |
| move.l a4,d0 *hex adress | |
| bsr conv_tohex8 | |
| move.l #" ",(a6)+ | |
| cmp.l sega_pc(pc),a4 *Check for PC marker | |
| bne.s .no | |
| move.b #">",-1(a6) | |
| .no: | |
| *get 128 bytes | |
| move.l a5,obj_start | |
| move.l a4,base_page | |
| move.l a5,dis_adr | |
| move.l a6,dis_ptr | |
| cmp.w #$4afc,(a5) | |
| bne.s .nobr | |
| lea breakptr_table(pc),a1 *if breakpoint replace 4afc with real data | |
| move.l a1,a2 | |
| moveq #max_breakptr-1,d7 | |
| .lopd: cmp.l 4(a1),a4 | |
| beq.s .f0 | |
| addq.w #8,a1 | |
| dbra d7,.lopd | |
| bra.s .nobr | |
| .f0: move.w 2(a1),(a5) | |
| .nobr: | |
| move.l a6,-(a7) | |
| bsr dis | |
| move.l (a7)+,a1 | |
| move.l a0,a5 | |
| move.l a0,d0 | |
| sub.l dis_adr,d0 | |
| add.w d0,a4 | |
| move.l a4,(a3)+ | |
| cmp.l #"dc $",(a1) | |
| bne.s .c1 | |
| cmp.l #"4AFC",4(A1) | |
| beQ.s .fo | |
| .c1: | |
| lea breakptr_table(pc),a0 | |
| moveq #max_breakptr-1,d0 | |
| move.l base_page(pc),a2 | |
| .lo: cmp.l 4(a0),a2 | |
| beq.s .fo | |
| addq.w #8,a0 | |
| dbra d0,.lo | |
| bra.s .c0 | |
| .fo: | |
| tst.w (a0) | |
| beq.s .c0 | |
| lea .temp(pc),a0 | |
| move.l #"ILLE",(a1)+ | |
| move.l #"GAL ",(a1)+ | |
| move.l #" ",(a1)+ | |
| move.l #" ",(a1)+ | |
| move.l #" ",(a1)+ | |
| move.l #" ",(a1)+ | |
| move.l #" ",(a1)+ | |
| move.l #" ",(a1)+ | |
| move.l #" ",(a1)+ | |
| clr.b (a1)+ | |
| .c0: | |
| move.w #1,cx | |
| lea .temp(pc),a0 | |
| bsr print_line | |
| addq.w #1,cy | |
| dbra d6,.nxtrad | |
| .x: | |
| move.l (a7)+,a6 | |
| move.w save_cx,cx | |
| move.w save_cy,cy | |
| move.l -16(a3),last_slut | |
| move.l disrowsize(pc),last_start | |
| rts | |
| .temp: ds.l 20 | |
| disrowsize: ds.l 12 | |
| last_start: dc.l 0 | |
| last_slut: dc.l 0 | |
| ************************************************** | |
| update_reg_window: | |
| move.w cx,save_cx | |
| move.w cy,save_cy | |
| *Update all Dataregs | |
| lea sega_regs(pc),a5 | |
| lea ascii_convtab(pc),a4 | |
| move.w #1,cy | |
| moveq #7,d7 | |
| moveq #"0",d6 | |
| .dl0: | |
| lea temp(pc),a0 | |
| move.b #"D",(a0)+ | |
| move.b d6,(a0)+ | |
| addq.w #1,d6 | |
| move.b #":",(a0)+ | |
| move.l (a5),d0 | |
| bsr conv_tohex8 | |
| move.b #" ",(a0)+ | |
| moveq #0,d0 | |
| moveq #3,d1 | |
| .lop move.b (a5)+,d0 | |
| move.b (a4,d0.w),d0 | |
| bne.s .c0 | |
| move.b #".",d0 | |
| .c0: move.b d0,(a0)+ | |
| dbra d1,.lop | |
| clr.b (a0)+ | |
| lea temp(pc),a0 | |
| move.w #1,cx | |
| bsr print_line | |
| addq.w #1,cy | |
| dbra d7,.dl0 | |
| *Update all Adress regs | |
| move.w #1,cy | |
| moveq #7,d7 | |
| moveq #"0",d6 | |
| .al0: | |
| lea temp(pc),a0 | |
| move.b #"A",(a0)+ | |
| move.b d6,(a0)+ | |
| addq.w #1,d6 | |
| move.b #":",(a0)+ | |
| move.l (a5)+,d0 | |
| bsr conv_tohex8 | |
| clr.b (a0)+ | |
| lea temp(pc),a0 | |
| move.w #19,cx | |
| bsr print_line | |
| addq.w #1,cy | |
| dbra d7,.al0 | |
| *Update SR | |
| move.w #19,cx | |
| move.w #9,cy | |
| lea temp(pc),a0 | |
| move.w #"SR",(a0)+ | |
| move.b #":",(a0)+ | |
| move.w sega_sr(pc),d0 | |
| bsr conv_tohex4 | |
| clr.b (a0) | |
| lea temp(pc),a0 | |
| bsr print_line | |
| *Update PC counter | |
| move.w #1,cx | |
| move.w #9,cy | |
| lea temp(pc),a0 | |
| move.w #"PC",(a0)+ | |
| move.b #":",(a0)+ | |
| move.l sega_pc(pc),d0 | |
| bsr conv_tohex8 | |
| clr.b (a0) | |
| lea temp(pc),a0 | |
| bsr print_line | |
| *Update AX data | |
| lea sega_axdata(pc),a1 | |
| lea hextab(pc),a2 | |
| move.w #1,cy | |
| moveq #7,d3 | |
| .yl1: lea temp(pc),a0 | |
| moveq #5,d2 | |
| .xl1: | |
| move.w (a1)+,d0 | |
| rept 4 | |
| rol.w #4,d0 | |
| moveq #15,d1 | |
| and.w d0,d1 | |
| move.b (a2,d1.w),(a0)+ | |
| endr | |
| move.b #" ",(a0)+ | |
| dbra d2,.xl1 | |
| move.w #40,cx | |
| clr.b (a0) | |
| lea temp(pc),a0 | |
| bsr print_line | |
| addq.w #1,cy | |
| dbra d3,.yl1 | |
| move.w save_cx,cx | |
| move.w save_cy,cy | |
| sf trace_flag | |
| rts | |
| ************************************************ | |
| update_mem_window: | |
| move.w cx,save_cx | |
| move.w cy,save_cy | |
| move.l memwin_ptr(pc),d6 | |
| lea memwin_buf(pc),a3 | |
| lea hextab(pc),a4 | |
| lea ascii_convtab(pc),a5 | |
| btst #0,d6 | |
| seq d5 | |
| move.w #12,cy | |
| moveq #10,d7 | |
| .ylop: | |
| lea temp(pc),a0 *adress | |
| move.l d6,d0 | |
| bsr conv_tohex8 | |
| move.b #" ",(a0)+ | |
| move.w (a3),d0 *hex output | |
| rept 2 | |
| rol.w #4,d0 | |
| moveq #15,d1 | |
| and.w d0,d1 | |
| move.b (a4,d1.w),(a0)+ | |
| endr | |
| tst.b d5 | |
| bne.s .no1 | |
| move.b #" ",(a0)+ | |
| .no1: | |
| rept 2 | |
| rol.w #4,d0 | |
| moveq #15,d1 | |
| and.w d0,d1 | |
| move.b (a4,d1.w),(a0)+ | |
| endr | |
| tst.b d5 | |
| beq.s .no2 | |
| move.b #" ",(a0)+ | |
| .no2: | |
| move.w 2(a3),d0 | |
| rept 2 | |
| rol.w #4,d0 | |
| moveq #15,d1 | |
| and.w d0,d1 | |
| move.b (a4,d1.w),(a0)+ | |
| endr | |
| tst.b d5 | |
| bne.s .no3 | |
| move.b #" ",(a0)+ | |
| .no3: | |
| rept 2 | |
| rol.w #4,d0 | |
| moveq #15,d1 | |
| and.w d0,d1 | |
| move.b (a4,d1.w),(a0)+ | |
| endr | |
| tst.b d5 | |
| beq.s .no4 | |
| move.b #" ",(a0)+ | |
| .no4: | |
| move.b #" ",(a0)+ | |
| moveq #0,d0 | |
| moveq #3,d1 | |
| .l1: move.b (a3)+,d0 | |
| move.b (a5,d0.w),d0 | |
| bne.s .c0 | |
| move.b #".",d0 | |
| .c0: move.b d0,(a0)+ | |
| dbra d1,.l1 | |
| clr.b (a0) | |
| lea temp(pc),a0 | |
| move.w #54,cx | |
| bsr print_line | |
| addq.w #1,cy | |
| addq.l #4,d6 | |
| dbra d7,.ylop | |
| move.w save_cx,cx | |
| move.w save_cy,cy | |
| rts | |
| ************************************************ | |
| *Convert D0 to hex at A0 | |
| conv_tohex8: | |
| moveq #7,d2 | |
| lea hextab(pc),a1 | |
| .lop | |
| rol.l #4,d0 | |
| moveq #15,d1 | |
| and.w d0,d1 | |
| move.b (a1,d1),(a0)+ | |
| dbra d2,.lop | |
| rts | |
| ******************************************** | |
| *Convert D0 to hex at A0 | |
| conv_tohex4: | |
| moveq #3,d2 | |
| lea hextab(pc),a1 | |
| .lop | |
| rol.w #4,d0 | |
| moveq #15,d1 | |
| and.w d0,d1 | |
| move.b (a1,d1),(a0)+ | |
| dbra d2,.lop | |
| rts | |
| ******************************************** | |
| *A0=pointer to window def table | |
| draw_all_windows: | |
| .l0: tst.w (a0) | |
| bmi.s .x | |
| move.l a0,-(a7) | |
| bsr draw_window | |
| move.l (a7)+,a0 | |
| addq.w #8,a0 | |
| bra .l0 | |
| .x: rts | |
| ******************************************** | |
| *a0=pointer to window datas | |
| draw_window: | |
| move.l phys,a1 | |
| add.w (a0)+,a1 | |
| move.w (a0)+,d4 | |
| mulu #80*16,d4 | |
| add.w d4,a1 | |
| *Draw top border corners | |
| move.w (a0),d0 | |
| move.l a1,a2 | |
| move.l a2,a3 | |
| add.w (a0),a3 | |
| moveq #16,d3 | |
| moveq #0,d4 | |
| t: set 0 | |
| rept 10 | |
| move.b d4,t(a2) | |
| move.b d4,t(a3) | |
| t: set t+80 | |
| endr | |
| move.b #31,t(a2) | |
| move.b #$f8,t(a3) | |
| t: set t+80 | |
| rept 5 | |
| move.b d3,t(a2) | |
| move.b #8,t(a3) | |
| t: set t+80 | |
| endr | |
| move.w (a0),d1 | |
| subq.w #2,d1 | |
| move.l a1,a2 | |
| addq.w #1,a2 | |
| move.l a2,a3 | |
| move.w 2(a0),d0 | |
| addq.w #2,d0 | |
| mulu #16*80,d0 | |
| add.w d0,a3 | |
| moveq #0,d3 | |
| .xlop1: | |
| t: set 0 | |
| rept 10 | |
| move.b d3,t(a2) | |
| t: set t+80 | |
| endr | |
| move.b #-1,t(a2) | |
| t: set t+80 | |
| rept 3 | |
| move.b d3,t(a2) | |
| t: set t+80 | |
| endr | |
| t: set 0 | |
| rept 7 | |
| move.b d3,t(a3) | |
| t: set t+80 | |
| endr | |
| move.b #-1,t(a3) | |
| t: set t+80 | |
| rept 5 | |
| move.b d3,t(a3) | |
| t: set t+80 | |
| endr | |
| addq.w #1,a2 | |
| addq.w #1,a3 | |
| dbra d1,.xlop1 | |
| *Draw mellan dellen | |
| add.w #80*16,a1 | |
| move.w 2(a0),d1 | |
| .ylop: move.w (a0),d0 | |
| subq.w #2,d0 | |
| move.l a1,a2 | |
| *Draw mellan delen | |
| move.b #16,d3 | |
| t: set 0 | |
| rept 16 | |
| move.b d3,t(a2) | |
| t: set t+80 | |
| endr | |
| addq.w #1,a2 | |
| moveq #0,d3 | |
| .xlop: | |
| t: set 0 | |
| rept 16 | |
| move.b d3,t(a2) | |
| t: set t+80 | |
| endr | |
| addq.w #1,a2 | |
| dbra d0,.xlop | |
| move.b #8,d3 | |
| t: set 0 | |
| rept 16 | |
| move.b d3,t(a2) | |
| t: set t+80 | |
| endr | |
| add.w #80*16,a1 | |
| dbra d1,.ylop | |
| *Draw bottom corners | |
| move.w (a0),d0 | |
| move.l a1,a2 | |
| move.l a2,a3 | |
| add.w (a0),a3 | |
| move.b #16,d3 | |
| moveq #0,d4 | |
| t: set 0 | |
| rept 7 | |
| move.b d3,t(a2) | |
| move.b #8,t(a3) | |
| t: set t+80 | |
| endr | |
| move.b #31,t(a2) | |
| move.b #$f8,t(a3) | |
| t: set t+80 | |
| rept 8 | |
| move.b d4,t(a2) | |
| move.b d4,t(a3) | |
| t: set t+80 | |
| endr | |
| rts | |
| ******************************************** | |
| init_display: | |
| move.w #11,cy | |
| move.w #0,cx | |
| dc.w $a00a | |
| lea ymultab(pc),a0 | |
| moveq #0,d1 | |
| moveq #49,d0 | |
| .lop: move.w d1,(a0)+ | |
| add.w #80*8,d1 | |
| dbra d0,.lop | |
| move.w #2,-(a7) | |
| trap #14 | |
| addq.l #2,a7 | |
| move.l d0,phys | |
| *make inverse font | |
| lea font(pc),a0 | |
| lea font_inv(pc),a1 | |
| move.w #2047,d1 | |
| .lop1 move.b (a0)+,d0 | |
| not.b d0 | |
| move.b d0,(a1)+ | |
| dbra d1,.lop1 | |
| pea .cls | |
| move.w #9,-(a7) | |
| trap #1 | |
| addq.l #6,a7 | |
| rts | |
| .cls: dc.b 27,"E",27,"Y",42,43,13,10,0 | |
| even | |
| **************************************** | |
| print_line: *a0=adr of line | |
| *a1=font | |
| *a3=ymultab | |
| movem.l d0-d2/a0-a4,-(a7) | |
| tst.b update_cyflag | |
| bne.s .ok2 | |
| move.w cy,d0 | |
| cmp.w max_y(pc),d0 | |
| bls.s .ok2 | |
| move.w max_y(pc),cy | |
| .ok2: | |
| lea font(pc),a1 | |
| lea ymultab(pc),a3 | |
| tst.b inv_flag | |
| beq.s .recalc | |
| lea font_inv(pc),a1 | |
| .recalc: | |
| move.l phys(pc),a2 | |
| add.w cx(pc),a2 *add | |
| move.w cy(pc),d1 | |
| add.w d1,d1 *add y | |
| tst.b font_size | |
| bmi.s .c0 | |
| add.w d1,d1 * | |
| .c0: add.w (a3,d1.w),a2 | |
| .lop: | |
| moveq #0,d2 | |
| move.b (a0)+,d2 | |
| beq .klar | |
| cmp.b #13,d2 | |
| beq .return | |
| cmp.b #10,d2 | |
| beq .line_feed | |
| lsl.w #3,d2 *font | |
| lea (a1,d2.w),a4 | |
| tst.b font_size | |
| bmi.s .size48 | |
| temp1: set 0 | |
| rept 8 | |
| move.b (A4),temp1(a2) | |
| move.b (a4)+,80+temp1(a2) | |
| temp1: set temp1+160 | |
| endr | |
| addq.w #1,a2 | |
| bra.s .lop | |
| .size48 | |
| move.b (A4)+,(a2) | |
| move.b (A4)+,80(a2) | |
| move.b (A4)+,160(a2) | |
| move.b (A4)+,240(a2) | |
| move.b (A4)+,320(a2) | |
| move.b (A4)+,400(a2) | |
| move.b (A4)+,480(a2) | |
| move.b (A4)+,560(a2) | |
| addq.w #1,a2 | |
| bra .lop | |
| .klar: | |
| movem.l (A7)+,d0-d2/a0-a4 | |
| rts | |
| .return: | |
| clr.w cx | |
| bra .recalc | |
| .line_feed: | |
| addq.w #1,cy | |
| bra .recalc | |
| **************************************** | |
| print_char: *char=tecken, output=80*24 | |
| *inv=0 om normal text, inv=-1 om inverse text | |
| *Font_size: 0=80*24, -1=80*48 | |
| movem.l d0-d2/a0-a3,-(a7) | |
| lea font(pc),a1 | |
| tst.b inv_flag | |
| beq.s .c0 | |
| lea font_inv(pc),a1 | |
| .c0: | |
| tst.b update_cyflag | |
| bne.s .ok2 | |
| move.w cy,d0 | |
| cmp.w max_y(pc),d0 | |
| bls.s .ok2 | |
| move.w max_y(pc),cy | |
| * bsr scroll_screen_up80x24 | |
| .ok2: | |
| moveq #0,d2 | |
| move.b char(pc),d2 | |
| cmp.b #13,d2 | |
| beq .return | |
| cmp.b #10,d2 | |
| beq .line_feed | |
| move.w cx(pc),d0 | |
| move.w cy(pc),d1 | |
| move.l phys(pc),a0 | |
| add.w d0,a0 *add | |
| add.w d1,d1 *add y | |
| add.w d1,d1 * | |
| lea ymultab(pc),a3 | |
| add.w (a3,d1.w),a0 | |
| lsl.w #3,d2 *font | |
| add.w d2,a1 | |
| tst.b font_size | |
| bmi.s .size48 | |
| temp1: set 0 | |
| rept 8 | |
| move.b (A1),temp1(a0) | |
| move.b (a1)+,80+temp1(a0) | |
| temp1: set temp1+160 | |
| endr | |
| bra .x | |
| ;--------------------- | |
| .size48: | |
| move.b (A1)+,(a0) | |
| move.b (A1)+,80(a0) | |
| move.b (A1)+,160(a0) | |
| move.b (A1)+,240(a0) | |
| move.b (A1)+,320(a0) | |
| move.b (A1)+,400(a0) | |
| move.b (A1)+,480(a0) | |
| move.b (A1)+,560(a0) | |
| ;--------------------- | |
| .x: | |
| addq.w #1,cx | |
| tst.b update_cyflag | |
| bne.s .ok | |
| move.w cx,d0 | |
| cmp.w max_x,d0 | |
| bls.s .ok | |
| clr.w cx | |
| moveq #0,d0 | |
| addq.w #1,cy | |
| .ok: | |
| movem.l (a7)+,d0-d2/a0-a3 | |
| rts | |
| .return: | |
| clr.w cx | |
| movem.l (a7)+,d0-d2/a0-a3 | |
| rts | |
| .line_feed: | |
| addq.w #1,cy | |
| movem.l (a7)+,d0-d2/a0-a3 | |
| rts | |
| ;******************************************* | |
| ymultab: ds.w 50 | |
| phys: dc.l 0 | |
| cx: dc.w 0 | |
| cy: dc.w 0 | |
| font_size: dc.b 0 | |
| update_cyflag: dc.b 0 *flagga om print_char rutinen skall updatera cy | |
| char: dc.b 0 | |
| inv_flag: dc.b 0 *inverse text flagga | |
| even | |
| max_y: dc.w 24 *antal rader p† sk„rmen | |
| max_x: dc.w 79 *antal columner | |
| tom: ds.l 40 | |
| font: incbin d:\genst\font.b | |
| font_inv: ds.l 512 | |
| ascii_convtab: | |
| .a dc.b 0 | |
| ds.b 31 | |
| dc.b " !",-1,"#$%&",-1,"()*+,-./" | |
| dc.b "0123456789:",0,0,0,0,0,0,"ABCDEFGHIJKLMNOPQRSTUVWXYZ[\]",0,"_",0 | |
| dc.b "ABCDEFGHIJKLMNOPQRSTUVWXYZ" | |
| dc.b 0,0,0,"~",0,0,0,0,0,"Ž",0,"",0,0,0,0,0,0,0,"Ž",0,0,0,0,"™",0,0,0,0,"™" | |
| .q: ds.b (.a+256)-.q | |
| even | |
| monitor_flag: dc.b 0 *0=sega running, -1=Segabug running | |
| lastkey_flag: dc.b 0 | |
| sega_axdata: ds.b 8*14 *12bytes som varje AX register pekar p† i Segan | |
| shift_flag: dc.b 0 | |
| trace_flag: dc.b 0 | |
| even | |
| memwin_typ: dc.w 0 | |
| *0=view SEGA | |
| *1=view ST | |
| *2=view Z80 | |
| *3=view VRAM | |
| dc.b "Memory SEGA",0 | |
| dc.b "Memory ST ",0 | |
| dc.b "Memory Z80 ",0 | |
| dc.b "Memory VRAM",0 | |
| dc.b "Dissasembly ST ",0 | |
| dc.b "Dissasembly SEGA",0 | |
| dc.b "Dissasembly Z80 ",0 | |
| diswin_typ: dc.w 0 | |
| *0=dis SEGA | |
| *1=dis ST | |
| *2=dis Z80 | |
| aktiv_window: dc.w 0 | |
| *0=memwin | |
| *1=diswin | |
| sega_sr: dc.w 0 | |
| save_cx: dc.w 0 | |
| save_cy: dc.w 0 | |
| last_key: dc.l 0 | |
| sega_pc: dc.l 0 | |
| memwin_ptr: dc.l 0 | |
| diswin_ptr: dc.l 0 | |
| sega_regs: ds.l 20 | |
| memwin_buf: | |
| ds.b 50 | |
| diswin_buf: | |
| ds.b 50 | |
| window_tab: | |
| dc.w 0,0 *start x,y | |
| dc.w 79,8 *width, height | |
| dc.w 53,11 *mem | |
| dc.w 25,10 | |
| dc.w 0,11 *dis | |
| dc.w 52,10 | |
| dc.l -1,-1 | |
| even | |
| **************************************************** | |
| lop: | |
| bsr get_command | |
| bsr process_command | |
| bra lop | |
| basepage: ds.l 1 | |
| *read | |
| ram: dc.w 5 *9 for Vram | |
| *5 for cartridge/Sram | |
| *11 REad z80 | |
| *Write | |
| ram2: dc.w 6 *6 for cart/sram mem | |
| *10 For Vram | |
| **************************************** | |
| process_command: | |
| lea rad(pc),a0 | |
| move.b (a0)+,d0 | |
| bne.s .noret | |
| move.b last_command(pc),d0 | |
| .noret: | |
| and.w #255-32,d0 | |
| move.b d0,last_command | |
| cmp.w #"Z",d0 | |
| bhi.s .x | |
| sub.w #"A",d0 | |
| bmi.s .x | |
| add.w d0,d0 | |
| add.w d0,d0 | |
| lea .bratab(pc,d0.w),a0 | |
| jmp (a0) | |
| .x: rts | |
| .bratab: | |
| bra alive a show alive | |
| bra set_breakpoint b set break point | |
| bra .x c | |
| bra diswin_set **disssasm window set / DIR | |
| bra .x e | |
| bra .fill f | |
| bra .go g Boot cartgame | |
| bra .x h | |
| bra .x i | |
| bra .setpc j **Set PC | |
| bra .x k | |
| bra load l **Load binary game from disk | |
| bra memwin_set m **set memwin baseadress | |
| bra .x n | |
| bra .x o | |
| bra project p *Load and exec project phile | |
| bra quit q **Quit debugger | |
| bra reset_sega r Reset megadrive | |
| bra .x s | |
| bra burst t Transfere game to Segamemory | |
| bra .x u | |
| bra .x v | |
| bra .x w | |
| bra .x x | |
| bra .x y | |
| bra memsize z | |
| .go: moveq #3,d0 | |
| bsr send_byte | |
| rts | |
| .setpc: | |
| moveq #"S",d0 | |
| bsr send_byte | |
| moveq #6,d0 | |
| bsr send_byte | |
| lea rad+1(pc),a0 | |
| bsr get_hexval | |
| move.l d0,d2 | |
| * move.l a0,d2 *send dest adress | |
| rept 4 | |
| move.b d2,d0 | |
| lsr.l #8,d2 | |
| bsr send_byte | |
| endr | |
| bsr update_reg_window | |
| rts | |
| .fill: | |
| moveq #"S",d0 | |
| bsr send_byte | |
| moveq #5,d0 | |
| bsr send_byte | |
| lea rad+1(pc),a0 | |
| bsr get_hexval | |
| bsr send_byte | |
| bsr recieve_byte | |
| tst.b d0 | |
| beq.s .ok | |
| moveq #18,d0 | |
| bsr print_msg | |
| rept 4 | |
| bsr recieve_byte *get adress that made error | |
| move.b d0,d2 | |
| ror.l #8,d2 | |
| endr | |
| move.l d2,d0 | |
| bsr write_hex8 | |
| bsr print_space | |
| bsr print_space | |
| bsr recieve_byte *get adress that made error | |
| bsr write_hex2 | |
| bsr print_space | |
| bsr print_space | |
| bsr recieve_byte *get adress that made error | |
| bsr write_hex2 | |
| rts | |
| .ok: moveq #0,d0 | |
| bsr print_msg | |
| rts | |
| ************************************************ | |
| memsize: | |
| illegal | |
| moveq #"S",d0 | |
| bsr send_byte | |
| moveq #11,d0 | |
| bsr send_byte | |
| rept 4 | |
| rol.l #8,d2 | |
| bsr recieve_byte *get adress that made error | |
| move.b d0,d2 | |
| endr | |
| moveq #0,d0 | |
| rts | |
| ************************************************ | |
| *load and execute project batch file | |
| project: | |
| move.l #dir_table,dir_pointer | |
| clr.l proj_pc | |
| lea rad+1(pc),a0 | |
| .l1: cmp.b #" ",(a0) | |
| bne.s .c0 | |
| addq.w #1,a0 | |
| bra.s .l1 | |
| .c0: | |
| lea proj_buf(pc),a1 | |
| bsr load_file | |
| tst.w d0 | |
| beq.s .c1 | |
| moveq #22,d0 | |
| bsr print_msg | |
| bra.s .no | |
| .c1: | |
| lea proj_buf(pc),a0 | |
| bsr decode_phile | |
| .no: moveq #0,d0 | |
| rts | |
| proj_pc: dc.l 0 | |
| dir_pointer: dc.l 0 | |
| file_size: dc.l 0 | |
| file_crc: dc.w 0 | |
| filename_start: dc.l 0 | |
| dir_table: ds.l 32*22 | |
| *format: | |
| *12b Filename.ext | |
| *4b start adr in Sega | |
| *4b Phile size in Sega | |
| *2b CRC vaule of phile *22bytes | |
| even | |
| proj_buf: ds.l 1024 | |
| ************************************************ | |
| set_drive: | |
| *d0=drive nummer | |
| *returns drivemap | |
| move.w d0,-(a7) | |
| move.w #$e,-(a7) | |
| trap #1 | |
| addq.l #4,a7 | |
| rts | |
| change_path:*a0=path | |
| move.l a0,-(a7) | |
| move.w #$3b,-(a7) | |
| trap #1 | |
| addq.l #6,a7 | |
| rts | |
| *************************************************** | |
| *Execute the commands in the project phile | |
| *a0=adr of ascii project phile | |
| decode_phile: | |
| _next1: | |
| move.b (a0),d0 | |
| beq .ok | |
| cmp.b #"#",d0 | |
| beq _comment | |
| cmp.b #"$",d0 | |
| beq _org | |
| cmp.b #":",1(a0) | |
| beq _path | |
| cmp.b #"\",(a0) | |
| beq _path | |
| move.l a0,a1 | |
| .lp2 cmp.b #10,(a1)+ | |
| bne.s .lp2 | |
| clr.b -2(a1) | |
| move.l a1,-(a7) | |
| move.l spel(pc),a1 | |
| ;-------------------------- | |
| bsr load_file *load phile into buffer | |
| tst.w d0 | |
| beq.s .c1 | |
| moveq #21,d0 | |
| bsr print_msg | |
| bra.s .no | |
| .c1: | |
| bsr make_crc *Get Checksum on current phile | |
| bsr add_to_dir *add data to dir table | |
| moveq #"S",d0 | |
| bsr send_byte | |
| moveq #4,d0 | |
| bsr send_byte | |
| move.l proj_pc(pc),a0 | |
| move.l spel(pc),a1 | |
| move.l file_size(pc),d0 | |
| subq.l #1,d0 | |
| bsr burst_send *transfere file into Sega | |
| move.l proj_pc(pc),d0 | |
| add.l file_size(pc),d0 | |
| btst #0,d0 | |
| beq.s .c0 *word align | |
| addq.l #1,d0 | |
| .c0: move.l d0,proj_pc | |
| .no: | |
| ;-------------------------- | |
| move.l (a7)+,a0 | |
| bra _next1 | |
| .ok: moveq #0,d0 | |
| rts | |
| _comment: | |
| .lp1 cmp.b #10,(a0)+ | |
| bne.s .lp1 | |
| bra _next1 | |
| _org: | |
| addq.w #1,a0 *skip $ | |
| move.l a0,a1 | |
| .lp2 cmp.b #10,(a1)+ | |
| bne.s .lp2 | |
| clr.b -2(a1) | |
| move.l a1,-(a7) | |
| bsr get_hexval | |
| move.l (a7)+,a0 | |
| move.l d0,proj_pc | |
| bra _next1 | |
| _path: | |
| cmp.b #":",1(a0) | |
| bne.s .nodr | |
| move.b (a0),d0 | |
| and.w #223,d0 | |
| sub.b #"A",d0 | |
| addq.w #2,a0 | |
| move.l a0,a4 | |
| bsr set_drive | |
| tst.w d0 | |
| bmi.s .er | |
| move.l a4,a0 | |
| .nodr: cmp.b #"\",(a0) | |
| bne.s .nopath | |
| move.l a0,a1 | |
| .lp2 cmp.b #10,(a1)+ | |
| bne.s .lp2 | |
| clr.b -2(a1) | |
| move.l a1,-(a7) | |
| bsr change_path | |
| tst.w d0 | |
| bmi.s .er | |
| move.l (a7)+,a0 | |
| bra _next1 | |
| .nopath: | |
| .lp3 cmp.b #10,(a0)+ | |
| bne.s .lp3 | |
| bra _next1 | |
| .er: moveq #-1,d0 | |
| rts | |
| .ok: moveq #0,d0 | |
| rts | |
| *************************************************** | |
| *Add current phile parameter to the dir pointer table | |
| add_to_dir: | |
| move.l dir_pointer(pc),a0 | |
| lea 12(a0),a2 | |
| move.l filename_start(pc),a1 | |
| move.l #" ",(a0) | |
| move.l #" ",4(a0) | |
| move.l #" ",8(a0) | |
| *copy phile name | |
| .lop1: move.b (a1)+,d0 | |
| beq.s .x1 | |
| cmp.b #".",d0 | |
| beq.s .c0 | |
| and.b #223,d0 | |
| .c0: move.b d0,(a0)+ | |
| bra.s .lop1 | |
| .x1: | |
| move.l proj_pc(pc),(a2)+ | |
| move.l file_size(pc),(a2)+ | |
| move.w file_crc(pc),(a2) | |
| add.l #22,dir_pointer | |
| rts | |
| *************************************************** | |
| make_crc: | |
| move.l buf(pc),a0 | |
| move.l file_size(pc),d0 | |
| subq.l #1,d0 | |
| moveq #0,d1 | |
| moveq #0,d2 | |
| .la: move.b (a0)+,d2 | |
| add.w d2,d1 | |
| subq.l #1,d0 | |
| tst.l d0 | |
| bpl.s .la | |
| move.w d1,file_crc | |
| rts | |
| ************************************************ | |
| *Load phile into memory | |
| *a0=adr of philename | |
| *a1=dest adress to load | |
| *return d0=0 if ok, d0=-1 error | |
| load_file: | |
| move.l a0,filename_start | |
| move.l a1,a4 | |
| clr.w -(a7) | |
| move.l a0,-(a7) | |
| move.w #$3d,-(a7) *open | |
| trap #1 | |
| addq.w #8,a7 | |
| tst.w d0 | |
| bmi.s .er | |
| move.w d0,d7 | |
| move.l a4,-(a7) | |
| move.l #1024*256,-(a7) | |
| move.w d0,-(a7) | |
| move.w #$3f,-(a7) | |
| trap #1 | |
| add.w #12,a7 | |
| tst.l d0 | |
| bmi.s .er | |
| beq.s .er | |
| move.l d0,file_size | |
| move.w d7,-(a7) | |
| move.w #$3e,-(a7) | |
| trap #1 | |
| addq.w #4,a7 | |
| tst.w d0 | |
| bmi.s .er | |
| moveq #0,d0 | |
| rts | |
| .er: moveq #-1,d0 | |
| rts | |
| ************************************************ | |
| *a0=adr in SEGA to breakpoint | |
| *d0=breakpoint number | |
| *d1=breakpoint typ | |
| *0:ingen breakpoint | |
| *1:permanent breakpoint | |
| *2:break once breakpoint | |
| set_breakpoint: | |
| lea rad(pc),a0 | |
| move.b 1(a0),d0 | |
| and.w #255-32,d0 | |
| cmp.b #"S",d0 | |
| beq.s .set | |
| cmp.b #"R",d0 | |
| beq.s .remove | |
| moveq #0,d0 | |
| rts | |
| .set: | |
| lea rad+2(pc),a0 | |
| bsr get_hexval | |
| tst.l d0 | |
| beq.s .x | |
| move.l d0,a0 | |
| moveq #1,d0 | |
| bsr add_break | |
| tst.w d0 | |
| bmi.s .er | |
| .x: | |
| bsr get_diswin_data | |
| bsr update_dis_window | |
| bsr get_memwin_data | |
| bsr update_mem_window | |
| moveq #0,d0 | |
| rts | |
| .remove: | |
| lea rad+2(pc),a0 | |
| bsr get_hexval | |
| tst.l d0 | |
| beq.s .x1 | |
| move.l d0,a0 | |
| bsr remove_breakpoint | |
| .x1: | |
| bsr get_diswin_data | |
| bsr update_dis_window | |
| bsr get_memwin_data | |
| bsr update_mem_window | |
| moveq #0,d0 | |
| rts | |
| .er: illegal | |
| ************************************************ | |
| *Set the baseadress for the Memwindow | |
| memwin_set: | |
| lea rad+1(pc),a0 | |
| bsr get_hexval | |
| tst.l d1 | |
| bne.s .x | |
| move.l d0,memwin_ptr | |
| .no1: | |
| bsr get_memwin_data | |
| bsr update_mem_window | |
| moveq #0,d0 | |
| .x: rts | |
| ************************************************ | |
| *Set the baseadress for the Dis window | |
| *Also dir | |
| diswin_set: | |
| move.b rad+1(pc),d0 | |
| lsl.w #8,d0 | |
| move.b rad+2(pc),d0 | |
| and.w #$9393,d0 | |
| cmp.w #"IR",d0 | |
| beq.s .dir | |
| lea rad+1(pc),a0 | |
| bsr get_hexval | |
| tst.l d1 | |
| bne.s .x | |
| move.l d0,diswin_ptr | |
| .no1: | |
| moveq #"S",d0 | |
| bsr send_byte | |
| moveq #2,d0 | |
| bsr send_byte | |
| lea diswin_buf(pc),a1 | |
| move.l diswin_ptr(pc),a0 | |
| moveq #48,d0 | |
| bsr burst_recieve | |
| bsr update_dis_window | |
| moveq #0,d0 | |
| .x: rts | |
| *--------------------------------------- | |
| .dir: | |
| illegal | |
| lea rad+2(pc),a0 | |
| moveq #0,d0 | |
| moveq #0,d1 | |
| .l0 move.b (a0)+,d0 | |
| beq.s .xx | |
| cmp.w #$21,d0 | |
| blt.s .l0 | |
| .xx: moveq #0,d0 | |
| rts | |
| ************************************************ | |
| quit: moveq #-1,d0 | |
| rts | |
| ************************************************ | |
| load: | |
| moveq #0,d1 | |
| lea rad+1(pc),a0 | |
| .l0 move.b (a0),d0 | |
| beq.s .ut | |
| move.b (a0)+,d0 | |
| cmp.b #" ",d0 *space? | |
| bne.s .ut | |
| move #0,-(a7) | |
| move.l a0,-(a7) | |
| move #$3d,-(a7) | |
| trap #1 | |
| addq.l #8,a7 | |
| tst.l d0 | |
| bmi .err | |
| move d0,d7 | |
| move.l spel,-(a7) | |
| move.l #512*1024,-(a7) | |
| move d7,-(a7) | |
| move #$3f,-(a7) | |
| trap #1 | |
| lea 12(a7),a7 | |
| tst.l d0 | |
| bmi .err | |
| move d7,-(a7) close | |
| move #$3e,-(a7) | |
| trap #1 | |
| addq.l #4,a7 | |
| tst.w d0 | |
| bne .err | |
| .ut: moveq #0,d0 | |
| bsr print_msg | |
| rts | |
| .err: moveq #1,d0 | |
| bsr print_msg | |
| moveq #0,d0 | |
| rts | |
| ************************************************ | |
| burst: | |
| moveq #"S",d0 | |
| bsr send_byte | |
| moveq #4,d0 | |
| bsr send_byte | |
| lea $00,A0 | |
| move.l spel,A1 | |
| add.w #$00,a1 | |
| move.l end_spel,d0 | |
| sub.l a1,d0 | |
| BSR burst_send | |
| tst.w d0 | |
| bne.s .er | |
| moveq #0,d0 | |
| bsr print_msg | |
| moveq #0,d0 | |
| rts | |
| .er: moveq #2,d0 | |
| bsr print_msg | |
| moveq #0,d0 | |
| rts | |
| ************************************************ | |
| trans: | |
| lea $0,A0 | |
| move.l spel,A1 | |
| move.l end_spel,d0 | |
| sub.l spel,d0 | |
| BSR poke_block | |
| tst.w d0 | |
| bne.s .er | |
| moveq #0,d0 | |
| bsr print_msg | |
| rts | |
| .er: moveq #2,d0 | |
| bsr print_msg | |
| rts | |
| reset_sega: | |
| bsr reset_megadrive | |
| bsr boot_sega | |
| rts | |
| ***************************************************** | |
| print_msg: | |
| move.w #0,cx | |
| move.w #24,cy | |
| add.w d0,d0 | |
| add.w d0,d0 | |
| move.l .msgtab(pc,d0.w),a0 | |
| bsr print_line | |
| rts | |
| .msgtab:dc.l .m0,.m1,.m2,.m3,.m4,.m5,.m6,.m7,.m8,.m9,.ma,.mb,.mc,.md,.me,.mf,.mg,.mh,.mj,.mk,.ml,.mm,.mn | |
| .m0: dc.b "OK ",0 | |
| .m1: dc.b "Error while reading file...",0 | |
| .m2: dc.b "Transfere error... ",0 | |
| .m3: dc.b "SEGA reseted... ",0 | |
| .m4: dc.b "*** Buss Error ",0 | |
| .m5: dc.b "*** Adress Error ",0 | |
| .m6: dc.b "*** Breakpoint reached ",0 | |
| .m7: dc.b "*** Division by Zero ",0 | |
| .m8: dc.b "*** CHK Exception ",0 | |
| .m9: dc.b "*** Trapv Exception ",0 | |
| .ma: dc.b "*** Priviedge Violation ",0 | |
| .mb: dc.b "*** Line-A ",0 | |
| .mc: dc.b "*** Line-F ",0 | |
| .md: dc.b "*** Extern Sega IRQ ",0 | |
| .me: dc.b "Problem while reseting ....",0 | |
| .mf: dc.b "Trace instruction ",0 | |
| .mg: dc.b "Trace exception ",0 | |
| .mh: dc.b "Sega GO ",0 | |
| .mj: dc.b "Fill error... ",0 | |
| .mk: dc.b "Skip instruction ",0 | |
| .ml: dc.b "Trace2 ",0 | |
| .mm: dc.b "binary file not found... ",0 *21 | |
| .mn: dc.b "Project file not found... ",0 *22 | |
| even | |
| ***************************************************** | |
| alive: | |
| moveq #1,d0 | |
| bsr send_byte | |
| lea temp(pc),a0 | |
| .lop: bsr recieve_byte | |
| move.b d0,(a0)+ | |
| bne.s .lop | |
| clr.b (a0)+ | |
| pea temp | |
| move.w #9,-(a7) | |
| trap #1 | |
| addq.l #6,a7 | |
| rts | |
| ***************************************************** | |
| *Poke a block of data from Sega to ST | |
| *a0=start adress in Sega to write to | |
| *a1=start adress in ST to read from | |
| *d0=antal bytes to Transfere, must be even number -1 | |
| *returns d0=0 om ok, d0=-1 om error | |
| poke_block: | |
| move.l $4ba,d5 | |
| movem.l d2-d5,-(a7) | |
| move.l d0,d3 | |
| move.l d0,d4 | |
| move.w ram2,d0 | |
| bsr send_byte | |
| move.l a0,d2 *send dest adress | |
| rept 4 | |
| move.b d2,d0 | |
| lsr.l #8,d2 | |
| bsr send_byte | |
| endr | |
| rept 4 *send length of block | |
| move.b d3,d0 | |
| lsr.l #8,d3 | |
| bsr send_byte | |
| endr | |
| moveq #0,d3 | |
| .lop: | |
| move.b (a1)+,d0 | |
| add.b d0,d3 | |
| bsr send_byte | |
| subq.l #1,d4 | |
| move.b (a1)+,d0 | |
| add.b d0,d3 | |
| bsr send_byte | |
| subq.l #1,d4 | |
| bpl.s .lop | |
| bsr recieve_byte | |
| cmp.b d0,d3 | |
| beq.s .ok | |
| move.l $4ba,d0 | |
| sub.l d5,d0 | |
| bsr write_hex8 | |
| moveq #-1,d0 | |
| movem.l (a7)+,d2-d5 | |
| bsr print_return | |
| rts | |
| .ok: | |
| move.l $4ba,d0 | |
| sub.l d5,d0 | |
| bsr write_hex8 | |
| bsr print_return | |
| moveq #0,d0 | |
| movem.l (a7)+,d2-d5 | |
| rts | |
| ***************************************************** | |
| ***************************************************** | |
| *Peek a block of data from Sega to ST | |
| *a0=start adress in Sega | |
| *a1=dest adress in ST | |
| *d0=antal bytes to Transfere | |
| *returns d0=0 om ok, d0=-1 om error | |
| peek_block: | |
| movem.l d2-d4,-(a7) | |
| move.l d0,d3 | |
| move.l d0,d4 | |
| move.w ram,d0 | |
| bsr send_byte | |
| move.l a0,d2 *send dest adress | |
| rept 4 | |
| move.b d2,d0 | |
| lsr.l #8,d2 | |
| bsr send_byte | |
| endr | |
| rept 4 *send length of block | |
| move.b d3,d0 | |
| lsr.l #8,d3 | |
| bsr send_byte | |
| endr | |
| * illegal | |
| moveq #0,d3 | |
| .lop: | |
| bsr recieve_byte | |
| move.b d0,(a1)+ | |
| add.b d0,d3 | |
| subq.l #1,d4 | |
| bpl.s .lop | |
| bsr recieve_byte | |
| cmp.b d0,d3 | |
| beq.s .ok | |
| moveq #-1,d0 | |
| movem.l (a7)+,d2-d4 | |
| rts | |
| .ok: moveq #0,d0 | |
| movem.l (a7)+,d2-d4 | |
| rts | |
| ******************************************* | |
| old_dptr: dc.l 0 | |
| temp: ds.l 100 | |
| ant_rader: dc.w 8 | |
| ******************************************* | |
| dump2: | |
| rts | |
| ******************************************* | |
| dump_cell: | |
| rts | |
| ******************************************* | |
| get_hexval: | |
| moveq #0,d0 | |
| moveq #0,d1 | |
| .l0 move.b (a0)+,d0 | |
| beq.s .tom | |
| cmp.w #$21,d0 | |
| blt.s .l0 | |
| move.w d0,d2 | |
| and.w #255-32,d2 | |
| cmp.b #"P",d2 | |
| beq.s .pc | |
| moveq #7,d2 | |
| .lop: | |
| lsl.l #4,d1 | |
| cmp.w #"0",d0 | |
| blt.s .err | |
| cmp.w #"9",d0 | |
| bhi.s .no1 | |
| sub.w #"0",d0 | |
| bra.s .no2 | |
| .no1: and.w #$df,d0 | |
| cmp.w #"A",d0 | |
| blt.s .err | |
| cmp.w #"F",d0 | |
| bhi.s .err | |
| sub.w #"A",d0 | |
| add.w #10,d0 | |
| .no2: | |
| or.b d0,d1 | |
| move.b (a0)+,d0 | |
| dbeq d2,.lop | |
| move.l d1,d0 | |
| moveq #0,d1 | |
| rts | |
| .pc: | |
| move.l sega_pc,d0 | |
| moveq #0,d1 | |
| rts | |
| .tom: moveq #-1,d1 | |
| rts | |
| .err: moveq #1,d1 | |
| rts | |
| ******************************************* | |
| write_hex8: | |
| movem.l d0-d3/a0-a3,-(a7) | |
| lea hextab(pc),a0 | |
| lea .buf(pc),a1 | |
| moveq #7,d2 | |
| .lop rol.l #4,d0 | |
| move.w d0,d1 | |
| and.w #15,d1 | |
| move.b (a0,d1.w),(a1)+ | |
| dbra d2,.lop | |
| clr.b (a1)+ | |
| pea .buf(pc) | |
| move.w #9,-(a7) | |
| trap #1 | |
| addq.l #6,a7 | |
| movem.l (a7)+,d0-d3/a0-a3 | |
| rts | |
| .buf: ds.b 10 | |
| ******************************************* | |
| write_hex2: | |
| movem.l d0-d3/a0-a3,-(a7) | |
| lea hextab(pc),a0 | |
| lea .buf(pc),a1 | |
| moveq #1,d2 | |
| .lop rol.b #4,d0 | |
| move.w d0,d1 | |
| and.w #15,d1 | |
| move.b (a0,d1.w),(a1)+ | |
| dbra d2,.lop | |
| clr.b (a1)+ | |
| pea .buf(pc) | |
| move.w #9,-(a7) | |
| trap #1 | |
| addq.l #6,a7 | |
| movem.l (a7)+,d0-d3/a0-a3 | |
| rts | |
| .buf: ds.b 10 | |
| ******************************************* | |
| print_dollar: | |
| movem.l d0-d3/a0-a3,-(a7) | |
| move.w #"$",-(a7) | |
| move.w #2,-(a7) | |
| trap #1 | |
| addq.l #4,a7 | |
| movem.l (a7)+,d0-d3/a0-a3 | |
| rts | |
| ******************************************* | |
| print_space: | |
| movem.l d0-d3/a0-a3,-(a7) | |
| move.w #" ",-(a7) | |
| move.w #2,-(a7) | |
| trap #1 | |
| addq.w #4,a7 | |
| movem.l (a7)+,d0-d3/a0-a3 | |
| rts | |
| ******************************************* | |
| print_return: | |
| movem.l d0-d3/a0-a3,-(a7) | |
| pea .ret | |
| move.w #9,-(a7) | |
| trap #1 | |
| addq.l #6,a7 | |
| movem.l (a7)+,d0-d3/a0-a3 | |
| rts | |
| .ret: dc.b 13,10,0,0 | |
| ******************************************* | |
| get_command: | |
| clr.l rad | |
| clr.l rad+4 | |
| clr.l rad+8 | |
| clr.l rad+12 | |
| clr.l rad+16 | |
| move.w #".",-(a7) | |
| move.w #2,-(a7) | |
| trap #1 | |
| addq.w #4,a7 | |
| pea line(pc) | |
| move.w #10,-(a7) | |
| trap #1 | |
| addq #6,a7 | |
| bsr print_return | |
| bsr print_return | |
| rts | |
| line: dc.b 80,0 | |
| rad: ds.b 80 | |
| ******************************************* | |
| *POKE an adress in SEGA, command $03 | |
| *a0 = adress to POKE | |
| *d0.b= vaule to POKE | |
| *format: | |
| *s 1 b Sync header ($EA) | |
| *s 4 b adress, lsb f”rst | |
| *s 1 b vaule to poke | |
| poke_sega: | |
| move.b d0,d2 | |
| move.b #$ea,d0 *send SYNC | |
| bsr send_byte | |
| move.l a0,d1 *send dest adress | |
| rept 4 | |
| move.b d1,d0 | |
| lsr.l #8,d1 | |
| bsr send_byte | |
| endr | |
| move.b d2,d0 | |
| bsr send_byte | |
| rts | |
| ******************************************* | |
| *PEEK an adress in the SEGA, command $02 | |
| *a0=adress to peek | |
| *format: | |
| *s 1 b Sync header ($EA) | |
| *s 4 b adress, lsb f”rst | |
| *r 1 b peeked vaule | |
| peek_sega: | |
| movem.l d1-d2,-(a7) | |
| moveq #2,d0 | |
| bsr send_byte | |
| move.l a0,d2 *send dest adress | |
| rept 4 | |
| move.b d2,d0 | |
| lsr.l #8,d2 | |
| bsr send_byte | |
| endr | |
| bsr recieve_byte | |
| and.w #$ff,d0 | |
| movem.l (a7)+,d1-d2 | |
| rts | |
| ******************************************* | |
| send_byte: | |
| *Set strobe high | |
| and.w #255,d0 | |
| bset #9,d0 | |
| add.w d0,d0 | |
| tst.w 100(a6,d0.w) | |
| mulu d1,d1 | |
| *wait for ack high | |
| lop1: btst #9,$fb0000 | |
| beq.s lop1 | |
| mulu d1,d1 | |
| *set strobe low | |
| tst.w 100(a6) | |
| mulu d1,d1 | |
| *wait for ack low | |
| lop2: btst #9,$fb0000 | |
| bne.s lop2 | |
| rts | |
| ************************************************* | |
| recieve_byte: | |
| recieve_byte1: | |
| *wait for strobe high from Sega | |
| .no: move.w $fb0000,d0 | |
| btst #8,d0 *r”r ej | |
| beq.s .no | |
| .noo: move.w $fb0000,d0 | |
| btst #8,d0 *r”r ej | |
| beq.s .noo | |
| and.w #255,d0 | |
| *set Ack high | |
| move.w #256*2+100,d1 *bit 8 | |
| tst.w (a6,d1.w) | |
| move.w #256*2+100,d1 *bit 8 | |
| tst.w (a6,d1.w) | |
| *wait for strobe low from Sega | |
| .no1: btst #8,$fb0000 | |
| bne.s .no1 | |
| .noo1: btst #8,$fb0000 | |
| bne.s .noo1 | |
| *Set ack low | |
| tst.w 100(a6) | |
| rts | |
| ************************************************* | |
| pause1: | |
| movem.l d0-d1,-(a7) | |
| move.w #26170,d1 | |
| .del: | |
| mulu d0,d0 | |
| mulu d0,d0 | |
| mulu d0,d0 | |
| dbra d1,.del | |
| movem.l (a7)+,d0-d1 | |
| rts | |
| ******************************************* | |
| reset_megadrive: | |
| moveq #5,d5 | |
| .again: | |
| lea $fa0000-100,a6 | |
| moveq #0,d0 | |
| tst.w 100(a6,d0.l) *clear latches | |
| moveq #0,d0 | |
| bset #10,d0 | |
| add.w d0,d0 | |
| tst.w 100(a6,d0.w) | |
| move.w #6170,d1 | |
| .del: | |
| mulu d0,d0 | |
| mulu d0,d0 | |
| dbra d1,.del | |
| tst.w 100(a6) | |
| move.w #3550,d1 | |
| .del2: mulu d0,d0 | |
| dbra d1,.del2 | |
| move.w $fb0000,d0 | |
| cmp.b #"O",d0 | |
| beq.s .ok | |
| moveq #14,d0 | |
| bsr print_msg | |
| bsr pause1 | |
| dbra d5,.again | |
| moveq #-1,d0 | |
| rts | |
| .ok: moveq #3,d0 | |
| bsr print_msg | |
| moveq #0,d0 | |
| rts | |
| ******************************************* | |
| init: move.l #0,-(a7) | |
| move.w #$20,-(A7) | |
| trap #1 | |
| addq.l #6,a7 | |
| lea $fa0000-100,a6 | |
| moveq #0,d0 | |
| tst.w 100(a6,d0.l) *clear latches | |
| move.l #514*1024,-(a7) | |
| move.w #$48,-(a7) | |
| trap #1 | |
| addq.l #6,a7 | |
| move.l d0,spel | |
| move.l d0,a0 | |
| add.l #1024*512-1,d0 | |
| move.l d0,end_spel | |
| move.l d0,a1 | |
| .lop: move.b #$ea,(a0)+ | |
| cmp.l a0,a1 | |
| * bhs.s .lop | |
| move.w #3,-(a7) | |
| move.w #$e,-(a7) | |
| trap #1 | |
| addq.l #4,a7 | |
| pea .path | |
| move.w #$3b,-(a7) | |
| trap #1 | |
| addq.l #6,a7 | |
| rts | |
| .path: dc.b "\",0 | |
| even | |
| ******************************************* | |
| *Transfere boot / init software to Sega | |
| boot_sega: | |
| lea .alive,a1 | |
| lea temp,a0 | |
| move.b #27,(a0)+ | |
| move.b #"Y",(a0)+ | |
| move.b #32+1,(a0)+ | |
| move.b #32+1,(a0)+ | |
| .lop: | |
| bsr recieve_byte | |
| move.b d0,(a0)+ | |
| cmp.b (a1)+,d0 | |
| * bne .err | |
| mulu d1,d1 | |
| cmp.b #"%",d0 | |
| beq.s .uta | |
| cmp.b #"!",d0 | |
| bne.s .lop | |
| .uta | |
| clr.b (a0)+ | |
| pea temp | |
| move.w #9,-(a7) | |
| trap #1 | |
| addq.l #6,a7 | |
| bsr pause1 | |
| move.w #$ea,d0 | |
| bsr send_byte | |
| lea code,a0 | |
| lea end_code,a1 | |
| move.l a1,d3 | |
| sub.l a0,d3 | |
| subq.l #1,d3 | |
| ror.w #8,d3 | |
| move.b d3,d0 | |
| bsr send_byte | |
| lsr.w #8,d3 | |
| move.b d3,d0 | |
| bsr send_byte | |
| .colop: | |
| mulu d1,d1 | |
| mulu d1,d1 | |
| mulu d1,d1 | |
| mulu d1,d1 | |
| mulu d1,d1 | |
| mulu d1,d1 | |
| mulu d1,d1 | |
| move.b (a0)+,d0 | |
| bsr send_byte | |
| cmp.l a0,a1 | |
| bhi.s .colop | |
| bsr recieve_byte | |
| move.b d0,d1 | |
| bsr recieve_byte | |
| lsl.w #8,d1 | |
| move.b d0,d1 | |
| rts | |
| .alive: dc.b "OK , I am alive, so what do do now!",0 | |
| even | |
| .err: illegal | |
| *************************************************** | |
| *Send a block to Sega with burst mode on | |
| *8.7 sec f|r 512 Kb | |
| burst_send: | |
| * movem.l d2-d7/a2,-(a7) | |
| lea $fa0000-100,a6 | |
| * move.l $4ba,d5 | |
| move.l d0,d3 | |
| move.l d0,d4 | |
| moveq #0,d0 | |
| tst.w 100(a6,d0.l) *clear latches | |
| move.l a0,d2 *send dest adress | |
| rept 4 | |
| move.b d2,d0 | |
| lsr.l #8,d2 | |
| bsr send_byte | |
| endr | |
| rept 4 *send length of block | |
| move.b d3,d0 | |
| lsr.l #8,d3 | |
| bsr send_byte | |
| endr | |
| lea $fb0000,a2 | |
| *Do the transfere | |
| moveq #0,d3 | |
| moveq #8,d6 | |
| .lop: | |
| moveq #0,d0 | |
| move.b (a1)+,d0 | |
| bset d6,d0 | |
| add.b d0,d3 | |
| add.w d0,d0 | |
| tst.w 100(a6,d0.w) | |
| *wait for ack change | |
| .no: btst d6,(a2) | |
| beq.s .no | |
| moveq #0,d0 | |
| move.b (a1)+,d0 | |
| add.b d0,d3 | |
| add.w d0,d0 | |
| tst.w 100(a6,d0.w) | |
| *wait for ack change | |
| .no1: btst d6,(a2) | |
| bne.s .no1 | |
| subq.l #2,d4 | |
| bpl.s .lop | |
| bsr recieve_byte | |
| move.b d0,d4 | |
| lsl.w #8,d4 | |
| bsr recieve_byte | |
| move.b d0,d4 | |
| ror.w #8,d4 | |
| cmp.w d4,d3 | |
| beq.s .ok | |
| BRA .ok | |
| move.l $4ba,d0 | |
| sub.l d5,d0 | |
| * bsr write_hex8 | |
| moveq #-1,d0 | |
| * movem.l (a7)+,d2-d7/a2 | |
| * bsr print_return | |
| rts | |
| .ok: | |
| * move.l $4ba,d0 | |
| sub.l d5,d0 | |
| * bsr write_hex8 | |
| * bsr print_return | |
| * moveq #"S",d0 | |
| * bsr send_byte | |
| * moveq #5,d0 | |
| * bsr send_byte | |
| bsr update_reg_window | |
| bsr update_mem_window | |
| bsr update_dis_window | |
| moveq #0,d0 | |
| * movem.l (a7)+,d2-d7/a2 | |
| rts | |
| .tid: dc.l 0 | |
| ifd diss | |
| include d:\sega\segadis.s | |
| endc | |
| *************************************************** | |
| hextab: dc.b "0123456789ABCDEF" | |
| last_command: dc.b 0 | |
| even | |
| stack: dc.l 0 | |
| vector_table: | |
| ds.l $80 | |
| buf: ds.l 20 | |
| spel: dc.l 0 | |
| end_spel:dc.l 0 | |
| ************************************************************ | |
| _varbase: equ $ffc000 | |
| code: | |
| org $ff0000 | |
| move #$2700,sr | |
| bra.s .c0 | |
| dc.b "SEGA-BUG (C) 1992 SYNCHRON ASSEMBLY VER 1.0",0 | |
| even | |
| .c0: | |
| lea $FFFFFC,a0 | |
| move.l a0,a7 | |
| move a0,usp | |
| lea $c0000,a6 | |
| move.w #$8004,$c00004 | |
| move.w #$814c,$c00004 | |
| move.l #_irq2,$68 | |
| move.l #_hbl,$70 | |
| move.l #_vbl,$78 | |
| * move.l #0,a0 | |
| * move.l a0,usp *Clear USP | |
| clr.w $c0000 | |
| *Start of the Segabug target software | |
| bsr init_segabug | |
| move #$2000,sr | |
| move.l #$12345678,d7 | |
| move.w #20000,d0 | |
| .de1: mulu d1,d1 | |
| mulu d2,d2 | |
| mulu d2,d2 | |
| mulu d2,d2 | |
| mulu d2,d2 | |
| mulu d2,d2 | |
| dbra d0,.de1 | |
| lea .tx,a0 | |
| lea 1,a1 | |
| * move.w #0,(a1) | |
| moveq #0,d0 | |
| * divu d0,d0 | |
| * moveq #"S",d0 | |
| * bsr _send_byte1 | |
| illegal | |
| .de2 | |
| moveq #1,d0 | |
| moveq #2,d0 | |
| move.l #3,d0 | |
| move.l #4,d0 | |
| move.l #5,d0 | |
| move.l #6,d0 | |
| move.l #7,d0 | |
| bra.s .de2 | |
| .tx: dc.b "Dettar „r 12" | |
| even | |
| ************************************************************ | |
| init_segabug: | |
| ************************************************************ | |
| lea _varbase,a0 *clear variabel arean | |
| moveq #63,d0 | |
| .lop: move.l #$12211221,(a0)+ | |
| dbra d0,.lop | |
| move.l #_irq2,$68 | |
| move.l #_hbl,$70 | |
| move.l #_vbl,$78 | |
| clr.w $c0000 | |
| movem.l d0/a0-a1,_saveallreg | |
| * Setup exception vectors | |
| lea _tab1,a0 | |
| lea 8,a1 | |
| l1: move.l (a0)+,d0 | |
| bmi.s x1 | |
| move.l d0,(a1)+ | |
| bra l1 | |
| x1: | |
| *Init IRQ2 regs | |
| move.w #$8b08,$c00004 | |
| move.b #$80,$a1000d | |
| move.b #0,$a1001f | |
| move.l #_illegal,$10 | |
| movem.l _saveallreg,d0/a0-a1 | |
| rts | |
| _tab1: dc.l _berr,_adrerr,_illegal,_zerodiv,_chk | |
| dc.l _trapv,_priv,_trace,_linea,_linef,-1 | |
| ************************************************************ | |
| _vbl: | |
| _hbl: rte | |
| _berr: move.l d0,_saveallreg | |
| moveq #1,d0 | |
| bra _exp1 | |
| _adrerr:move.l d0,_saveallreg | |
| moveq #2,d0 | |
| bra _exp1 | |
| _illegal: | |
| movem.l d0-d7/a0-a7,_saveallreg | |
| move.w #3,_exp_type | |
| move.w 0(a7),_sr *SR | |
| move.l 2(a7),_pc | |
| lea $c0000,a6 | |
| bsr _send_allregs | |
| *Kolla om illegalen „r en breakpoint | |
| lea break_table,a0 | |
| moveq #max_breakptr-1,d0 | |
| move.l _pc,a1 | |
| .la: cmp.l 4(a0),a1 | |
| beq.s .f | |
| addq.w #8,a0 | |
| dbra d0,.la | |
| bra _irq5 | |
| .f: cmp.w #2,(a0) | |
| beq.s .brk2 | |
| bra _irq5 | |
| .brk2: *1g†ngs breakpoint, „r utf”rd och ta d† bort den | |
| move.w 2(a0),(a1) | |
| clr.l (a0)+ | |
| clr.l (a0) | |
| bra _irq5 | |
| _zerodiv:move.w #4,_exp_type | |
| bra _irq3 | |
| _chk: move.w #5,_exp_type | |
| bra _irq3 | |
| _trapv: move.w #6,_exp_type | |
| bra _irq3 | |
| _priv: move.w #7,_exp_type | |
| bra _irq3 | |
| _linea: move.w #8,_exp_type | |
| bra _irq3 | |
| _linef: move.w #9,_exp_type | |
| bra _irq3 | |
| _exp1: | |
| movem.l d1-d7/a0-a7,_saveallreg+4 | |
| move.l $70,save_hbl | |
| move.l $78,save_vbl | |
| move.l #_hbl,$70 | |
| move.l #_vbl,$78 | |
| move.w (a7),_savestack *Access type | |
| move.l 2(a7),_pc2 *Current cycle | |
| move.w 6(a7),_ir *Instruction register | |
| move.w 8(a7),_sr *SR | |
| move.l 10(a7),_pc | |
| move.w d0,_exp_type | |
| addq.l #8,a7 | |
| bra _irq4 | |
| rte | |
| _trace: | |
| move #$2700,sr | |
| move.w #13,_exp_type | |
| bra _irq3 | |
| _irq2: | |
| move #$2700,sr | |
| move.w #12,_exp_type | |
| _irq3: | |
| movem.l d0-d7/a0-a7,_saveallreg | |
| move.w 0(a7),_sr *SR | |
| move.l 2(a7),_pc | |
| _irq5: | |
| move.l $70,save_hbl | |
| move.l $78,save_vbl | |
| move.l #_hbl,$70 | |
| move.l #_vbl,$78 | |
| _irq4: | |
| lea $c0000,a6 | |
| moveq #"D",d0 | |
| bsr _send_byte1 | |
| move.w _exp_type,d0 | |
| bsr _send_byte1 | |
| bsr _send_axdata | |
| bsr _send_allregs | |
| ******Here starts the real Remote Debugger code | |
| *Header 'S' | |
| *1: Continue exection | |
| *2: Burstsend data from SRAM to ST | |
| *3: Trace PC | |
| *4: Burst recieve data to SEGA from ST | |
| *5: Get all regs | |
| *6: set PC | |
| *7: Set breakpoint nr xx= Illegal command and save old instruction | |
| *8: Burst Send data from Z80 to ST | |
| *9: Burst send data from Vram to ST | |
| *10:Remove breakpoint at adr xxxx and restore old opcode | |
| *11:Get Sram size in Sega | |
| *Wait for command | |
| .wa: bsr _receive_byte | |
| cmp.b #"S",d0 | |
| bne.s .wa | |
| bsr _receive_byte | |
| cmp.w #1,d0 | |
| beq.s .exit | |
| cmp.w #3,d0 | |
| beq.s .trace | |
| add.w d0,d0 | |
| add.w d0,d0 | |
| move.l .tab(pc,d0.w),a0 | |
| jsr (a0) | |
| bra.s .wa | |
| .tab: dc.l .no,.no,_burst_send,.no,_burst_recieve,_fill,_set_pc,_set_break | |
| dc.l _read_z80,_read_vram,_remove_break,_get_memsize | |
| .exit: movem.l _saveallreg,d0-d7/a0-a6 | |
| move.l _sr,(a7) | |
| move.l _pc,2(a7) | |
| and.w #$7fff,(a7) | |
| move.l save_hbl,$70 | |
| move.l save_vbl,$78 | |
| rte | |
| .no: rts | |
| .trace: | |
| move.l _pc,a0 | |
| cmp.w #$4afc,(a0) | |
| beq .wa | |
| .c0: move.l #_trace,$24 | |
| movem.l _saveallreg,d0-d7/a0-a6 | |
| move.l _sr,(a7) | |
| move.l _pc,2(a7) | |
| or.w #$8000,(a7) | |
| move.l save_hbl,$70 | |
| move.l save_vbl,$78 | |
| rte | |
| ************************************************************ | |
| *Get memory SRAM size | |
| _get_memsize: | |
| lea $fffe,a0 | |
| .l1: move.w (a0),d0 | |
| move.w d0,d1 | |
| not.w (a0) | |
| not.w d1 | |
| cmp.w (a0),d1 | |
| bne.s .no | |
| move.w d0,(a0) | |
| add.l #$10000,a0 | |
| bra.s .l1 | |
| .no: move.w d0,(a0) | |
| sub.l #$ffff,a0 | |
| move.l a0,d2 | |
| rept 4 | |
| rol.l #8,d2 | |
| move.b d2,d0 | |
| bsr _send_byte1 | |
| endr | |
| rts | |
| ************************************************************ | |
| _remove_break: | |
| bsr _receive_byte *get break number to remove | |
| lea break_table,a0 | |
| lsl.w #3,d0 | |
| lea (a0,d0.w),a0 | |
| tst.w (a0) | |
| beq.s .x | |
| move.l 4(a0),a1 | |
| move.w 2(a0),(a1) | |
| clr.l (a0)+ | |
| clr.l (a0) | |
| .x: rts | |
| ************************************************************ | |
| *Burst read VRAM | |
| _read_vram: | |
| lea $c00000,a4 | |
| move.l d1,d6 | |
| lsl.l #2,d6 | |
| lsr.w #2,d6 | |
| swap d6 | |
| move.l d6,4(a4) | |
| lea _temp,a3 | |
| rept 4 | |
| bsr _receive_byte *get start adress | |
| move.b d0,(a3)+ | |
| endr | |
| move.l _temp,d6 | |
| and.l #-2,d6 *even word only | |
| lsl.l #2,d6 | |
| lsr.w #2,d6 | |
| swap d6 | |
| move.l d6,4(A4) | |
| lea _temp,a3 | |
| rept 4 *get antal bytes | |
| bsr _receive_byte | |
| move.b d0,(a3)+ | |
| endr | |
| move.l _temp,d2 | |
| lea $c0000,a6 | |
| clr.w (a6) | |
| moveq #8,d6 | |
| moveq #0,d3 | |
| move.w #256,d5 | |
| moveq #0,d0 | |
| lea $c00000,a4 | |
| .lop: | |
| move.w (a4),_temp | |
| move.b _temp,d0 | |
| add.b d0,d3 *Add checksum | |
| or.w d5,d0 *bset #8 | |
| move.w d0,(a6) | |
| *wait for ack change | |
| .no: btst d6,(a6) | |
| beq.s .no | |
| move.b _temp+1,d0 | |
| add.b d0,d3 *Add checksum | |
| and.w #255,d0 *bclr #8 | |
| move.w d0,(a6) | |
| *wait for ack change | |
| .no1: btst d6,(a6) | |
| bne.s .no1 | |
| subq.l #2,d2 | |
| bpl.s .lop | |
| clr.w (a6) | |
| move.w d3,d0 | |