31 lines
424 B
ArmAsm
31 lines
424 B
ArmAsm
.define Sdi, Sdo
|
|
.sect .text
|
|
.sect .rom
|
|
.sect .data
|
|
.sect .bss
|
|
.sect .text
|
|
|
|
! The subroutine Sdi takes a fourbyte word and stores it
|
|
! at the address in registerpair AX.
|
|
! If the address is in zeropage, Sdo is used.
|
|
|
|
|
|
Sdi:
|
|
stx ADDR ! address (lowbyte)
|
|
sta ADDR+1 ! address (highbyte)
|
|
Sdo:
|
|
ldy #0
|
|
1: jsr Pop
|
|
pha
|
|
txa
|
|
sta (ADDR),y ! store lowbyte
|
|
iny
|
|
pla
|
|
sta (ADDR),y ! store highbyte
|
|
iny
|
|
cpy #4
|
|
bne 1b
|
|
rts
|
|
|
|
|