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; | |
; READBLCK.ASM | |
; pasmo -d -v readblck.asm readblck.bin | |
; | |
RDSLT: equ 0x000c | |
slotID: equ 2 ; cartucho no slot 2 | |
org 0x9000-7 | |
proc | |
db 0xfe ; arquivo binário do MSX-BASIC | |
dw start | |
dw stop | |
dw exec | |
start: | |
exec: | |
ld bc,0x2000 ; tamanho do block (8192 bytes) | |
ld de,0xa000 ; endereço de destino | |
ld hl,0x4000 ; endereço de origem | |
loop: | |
push bc ; salva 'BC' na pilha | |
push de ; salva 'DE' na pilha | |
ld a,slotID ; slot a ser lido | |
call RDSLT ; lê endereço 'HL' no slot. | |
pop de ; recupera 'DE' da pilha | |
pop bc ; recupera 'BC' da pilha | |
ld (de),a ; salva o valor de 'A' no | |
; endereço apontado por 'DE' | |
dec bc ; decrementa 'BC' | |
inc de ; incrementa 'DE' | |
inc hl ; incrementa 'HL' | |
ld a,b ; 'A' = 'B' | |
or c ; 'A' = 'A' or 'C' | |
cp 0 ; compara com zero | |
jr nz, loop ; se != 0, vá para "loop" | |
ret ; sai do programa | |
stop: | |
endp |
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