Jimmy Dansbo JimmyDansbo
JimmyDansbo
/ jd-4bit-demo.asm
Created
January 21, 2020 06:28
Short example of loading 4bpp picture into VERA
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| *=$0801 | |
| !byte $0C,$08,$0A,$00,$9E,' ','2','0','6','4',$00,$00,$00 | |
| *=$0810 | |
| VERA_BASE = $9F20 | |
| VERA_ADDR_LOW = VERA_BASE+0 | |
| VERA_ADDR_HIGH = VERA_BASE+1 | |
| VERA_ADDR_BANK = VERA_BASE+2 | |
| VERA_DATA0 = VERA_BASE+3 | |
| VERA_DATA1 = VERA_BASE+4 |
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| *=$0801 | |
| !word $080C ; Pointer to next BASIC line | |
| !word $000A ; Line number $000A = 10 | |
| !byte $9E ; SYS BASIC token | |
| !pet " $810",0 ; Address where ASM starts | |
| !word $0000 ; EOF BASIC program | |
| *=$0810 | |
| CHROUT = $FFD2 | |
| SEED = $9F64 ; VIA timer low-byte |
JimmyDansbo
/ helloworld_vera_rom_acme.asm
Created
December 26, 2020 10:11
Hello World as a Commander X16 ROM image
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| !cpu 65c02 | |
| VERA_ADDR_L = $9F20 | |
| VERA_ADDR_M = $9F21 | |
| VERA_ADDR_H = $9F22 | |
| VERA_DATA0 = $9F23 | |
| VERA_CTRL = $9F25 | |
| VERA_DC_VIDEO = $9F29 | |
| VERA_DC_HSCALE = $9F2A | |
| VERA_DC_VSCALE = $9F2B | |
| VERA_DC_HSTOP = $9F2A |
JimmyDansbo
/ jd-4bpp-bmp-directly-to-vram.asm
Last active
October 18, 2022 08:05
Example of loading af 4bpp bitmap directly to VRAM by using the KERNAL API calls - R38
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| *=$0801 | |
| !byte $0C,$08,$0A,$00,$9E,' ','2','0','6','4',$00,$00,$00 | |
| *=$0810 | |
| VERA_BASE = $9F20 | |
| VERA_ADDR_L = VERA_BASE | |
| VERA_ADDR_M = VERA_BASE+1 | |
| VERA_ADDR_H = VERA_BASE+2 | |
| VERA_DATA0 = VERA_BASE+3 | |
| VERA_DC = VERA_BASE+9 |
JimmyDansbo
/ verahello.asm
Created
December 19, 2020 11:17
Example of writing text to screen using VERA on Commander X16
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| !cpu 65c02 | |
| ; BASIC program ("10 SYS $0810") | |
| *=$0801 | |
| !word $080C ; Pointer to next BASIC line | |
| !word $000A ; Line number $000A = 10 | |
| !byte $9E ; SYS BASIC token | |
| !pet " $810",0 ; Address where ASM starts | |
| !word $0000 ; EOF BASIC program | |
| *=$0810 |
JimmyDansbo
/ x16speed.asm
Last active
April 15, 2024 14:13
Small program to show the difference in speed on the Commander X16 with different clock speeds. Result is the amount of increments that were possible within VERA 60Hz interrupt cycle. Build with cl65 -t cx16 -o X16SPEED.PRG x16speed.asm
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| .segment "STARTUP" | |
| .segment "INIT" | |
| .segment "ONCE" | |
| .segment "CODE" | |
| IRQVECTOR = $0314 | |
| VERA_IEN = $9F26 | |
| VERA_ISR = $9F27 | |
| CHROUT = $FFD2 |