42 lines
467 B
ArmAsm
42 lines
467 B
ArmAsm
|
|
|
|
.importzp TEMP, PPU_CTRL_VAR, PPU_CTRL_VAR1, SCROLL_X1
|
|
.import popax
|
|
.include "nes.inc"
|
|
.include "zpvars.inc"
|
|
.export _split
|
|
|
|
;;void __fastcall__ split(unsigned int x,unsigned int y);
|
|
|
|
_split:
|
|
|
|
jsr popax
|
|
sta <SCROLL_X1
|
|
txa
|
|
and #$01
|
|
sta <TEMP
|
|
lda <PPU_CTRL_VAR
|
|
and #$fc
|
|
ora <TEMP
|
|
sta <PPU_CTRL_VAR1
|
|
|
|
@3:
|
|
|
|
bit PPU_STATUS
|
|
bvs @3
|
|
|
|
@4:
|
|
|
|
bit PPU_STATUS
|
|
bvc @4
|
|
|
|
lda <SCROLL_X1
|
|
sta PPU_SCROLL
|
|
lda #0
|
|
sta PPU_SCROLL
|
|
lda <PPU_CTRL_VAR1
|
|
sta PPU_CTRL
|
|
|
|
rts
|
|
|