Posted By
Harry Potter
on 2022-03-11
10:49:55
|  Re: MemBankP4/cc65: demo prg won't load data to expansion RAM
Oops, I forgot the memory-writing code:
------------------------------
.segment "LOWCODE"
_bank1_writebyte:
;jsr popa
pha
jsr popax
sta ptr1
stx ptr1+1
pla
ldy #0
jmp bank1_writebytedirect
_bank1_writeword:
;jsr popax
pha
stx tmp1
jsr popax
sta ptr1
stx ptr1+1
pla
ldx tmp1
jmp bank1_writeworddirect
.segment "MEMBANK"
bank1_writebytedirect:
;sta $FF02
pha
lda #$2
sta $FD16
pla
sta (ptr1),y
lda #$3
sta $FD16
rts
bank1_writeworddirect:
pha
lda #$2
sta $FD16
pla
sta $FF02
sta (ptr1),y
iny
txa
sta (ptr1),y
lda #$3
sta $FD16
rts
|
