117 lines
3.6 KiB
NASM
117 lines
3.6 KiB
NASM
;--------------------------------------------------------------------------------
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Validate_SRAM:
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RTL
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;--------------------------------------------------------------------------------
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ClearExtendedSaveFile:
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STA $700400, X ; what we wrote over
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STA $700500, X
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STA $700600, X
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STA $700700, X
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STA $700800, X
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STA $700900, X
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STA $700A00, X
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STA $700B00, X
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STA $700C00, X
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STA $700D00, X
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STA $700E00, X
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STA $700F00, X
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RTL
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;--------------------------------------------------------------------------------
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ClearExtendedWRAMSaveFile:
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STA $7EF400, X ; what we wrote over
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STA $7F6500, X
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STA $7F6600, X
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STA $7F6700, X
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STA $7F6800, X
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STA $7F6900, X
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STA $7F6A00, X
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STA $7F6B00, X
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STA $7F6C00, X
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STA $7F6D00, X
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STA $7F6E00, X
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STA $7F6F00, X
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RTL
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;--------------------------------------------------------------------------------
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CopyExtendedSaveFileToWRAM:
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PHA
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SEP #$30
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LDA $4300 : PHA ; preserve DMA parameters
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LDA $4301 : PHA ; preserve DMA parameters
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LDA $4302 : PHA ; preserve DMA parameters
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LDA $4303 : PHA ; preserve DMA parameters
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LDA $4304 : PHA ; preserve DMA parameters
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LDA $4305 : PHA ; preserve DMA parameters
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LDA $4306 : PHA ; preserve DMA parameters
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;--------------------------------------------------------------------------------
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LDA #$00 : STA $4300 ; set DMA transfer direction A -> B, bus A auto increment, single-byte mode
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LDA #$80 : STA $4301 ; set bus B source to WRAM register
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LDA #$00 : STA $2181 ; set WRAM register source address
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LDA #$65 : STA $2182
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LDA #$7F : STA $2183
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STZ $4302 ; set bus A destination address to SRAM
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LDA #$05 : STA $4303
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LDA #$70 : STA $4304
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LDA #$00 : STA $4305 ; set transfer size to 0xB00
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LDA #$0B : STA $4306 ; STZ $4307
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LDA #$01 : STA $420B ; begin DMA transfer
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;--------------------------------------------------------------------------------
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PLA : STA $4306 ; restore DMA parameters
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PLA : STA $4305 ; restore DMA parameters
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PLA : STA $4304 ; restore DMA parameters
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PLA : STA $4303 ; restore DMA parameters
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PLA : STA $4302 ; restore DMA parameters
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PLA : STA $4301 ; restore DMA parameters
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PLA : STA $4300 ; restore DMA parameters
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REP #$30
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PLA
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STA $7EC00D ; what we wrote over
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RTL
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;--------------------------------------------------------------------------------
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CopyExtendedWRAMSaveFileToSRAM:
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PHA
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PHB
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SEP #$30
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LDA #$00 : PHA : PLB
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LDA $4300 : PHA ; preserve DMA parameters
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LDA $4301 : PHA ; preserve DMA parameters
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LDA $4302 : PHA ; preserve DMA parameters
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LDA $4303 : PHA ; preserve DMA parameters
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LDA $4304 : PHA ; preserve DMA parameters
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LDA $4305 : PHA ; preserve DMA parameters
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LDA $4306 : PHA ; preserve DMA parameters
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;--------------------------------------------------------------------------------
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LDA #$80 : STA $4300 ; set DMA transfer direction B -> A, bus A auto increment, single-byte mode
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STA $4301 ; set bus B source to WRAM register
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LDA #$00 : STA $2181 ; set WRAM register source address
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LDA #$65 : STA $2182
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LDA #$7F : STA $2183
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STZ $4302 ; set bus A destination address to SRAM
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LDA #$05 : STA $4303
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LDA #$70 : STA $4304
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LDA #$00 : STA $4305 ; set transfer size to 0xB00
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LDA #$0B : STA $4306 ; STZ $4307
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LDA #$01 : STA $420B ; begin DMA transfer
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;--------------------------------------------------------------------------------
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PLA : STA $4306 ; restore DMA parameters
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PLA : STA $4305 ; restore DMA parameters
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PLA : STA $4304 ; restore DMA parameters
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PLA : STA $4303 ; restore DMA parameters
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PLA : STA $4302 ; restore DMA parameters
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PLA : STA $4301 ; restore DMA parameters
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PLA : STA $4300 ; restore DMA parameters
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REP #$30
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PLB
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PLA
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LDX.w #$0000 : TXA ; what we wrote over
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RTL
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