60 lines
2.0 KiB
NASM
60 lines
2.0 KiB
NASM
;================================================================================
|
|
; RTPreview SRAM Hook
|
|
;--------------------------------------------------------------------------------
|
|
WriteStatusPreview:
|
|
PHA
|
|
LDA $4300 : PHA ; preserve DMA parameters
|
|
LDA $4301 : PHA ; preserve DMA parameters
|
|
LDA $4302 : PHA ; preserve DMA parameters
|
|
LDA $4303 : PHA ; preserve DMA parameters
|
|
LDA $4304 : PHA ; preserve DMA parameters
|
|
LDA $4305 : PHA ; preserve DMA parameters
|
|
LDA $4306 : PHA ; preserve DMA parameters
|
|
;--------------------------------------------------------------------------------
|
|
LDA #$80 : STA $4300 ; set DMA transfer direction B -> A, bus A auto increment, single-byte mode
|
|
|
|
STA $4301 ; set bus B source to WRAM register
|
|
|
|
LDA #$40 : STA $2181 ; set WRAM register source address
|
|
LDA #$F3 : STA $2182
|
|
LDA #$7E : STA $2183
|
|
|
|
STZ $4302 ; set bus A destination address to SRAM
|
|
LDA #$1E : STA $4303
|
|
LDA #$70 : STA $4304
|
|
|
|
LDA #$80 : STA $4305 ; set transfer size to 0x180
|
|
LDA #$01 : STA $4306 ; STZ $4306
|
|
|
|
LDA #$01 : STA $420B ; begin DMA transfer
|
|
;--------------------------------------------------------------------------------
|
|
PLA : STA $4306 ; restore DMA parameters
|
|
PLA : STA $4305 ; restore DMA parameters
|
|
PLA : STA $4304 ; restore DMA parameters
|
|
PLA : STA $4303 ; restore DMA parameters
|
|
PLA : STA $4302 ; restore DMA parameters
|
|
PLA : STA $4301 ; restore DMA parameters
|
|
PLA : STA $4300 ; restore DMA parameters
|
|
PLA
|
|
RTL
|
|
;--------------------------------------------------------------------------------
|
|
;WriteStatusPreview:
|
|
; PHA : PHX : PHP
|
|
;
|
|
; REP #$20 ; set 16-bit accumulator
|
|
; CLC
|
|
; LDX.b #$00
|
|
; -
|
|
; LDA $7EF340, X : STA $701E00, X
|
|
; LDA $7EF340+2, X : STA $701E00+2, X
|
|
; LDA $7EF340+4, X : STA $701E00+4, X
|
|
; TXA : ADC.b #$06 : TAX
|
|
; CPX #$24 : !BLT -
|
|
;
|
|
; SEP #$20 ; set 8-bit accumulator
|
|
; LDA $7EF374 : STA $701E24
|
|
; LDA $7EF37A : STA $701E25
|
|
;
|
|
; PLP : PLX : PLA
|
|
;RTL
|
|
;-------------------------------------------------------------------------------- |