alttpr-gwaa-kiwi/alttpr-baserom
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Code Pull Requests 1 Releases Activity

Make the exted save slot actually available

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Including WRAM mirror
This commit is contained in:
Kevin Cathcart
2018-10-13 12:44:23 -04:00
parent ef88153090
commit 929114da5a
5 changed files with 173 additions and 11 deletions
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116
save.asm Normal file
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@@ -0,0 +1,116 @@
;--------------------------------------------------------------------------------
Validate_SRAM:
RTL
;--------------------------------------------------------------------------------
ClearExtendedSaveFile:
STA $700400, X ; what we wrote over
STA $700500, X
STA $700600, X
STA $700700, X
STA $700800, X
STA $700900, X
STA $700A00, X
STA $700B00, X
STA $700C00, X
STA $700D00, X
STA $700E00, X
STA $700F00, X
RTL
;--------------------------------------------------------------------------------
ClearExtendedWRAMSaveFile:
STA $7EF400, X ; what we wrote over
STA $7F6500, X
STA $7F6600, X
STA $7F6700, X
STA $7F6800, X
STA $7F6900, X
STA $7F6A00, X
STA $7F6B00, X
STA $7F6C00, X
STA $7F6D00, X
STA $7F6E00, X
STA $7F6F00, X
RTL
;--------------------------------------------------------------------------------
CopyExtendedSaveFileToWRAM:
PHA
SEP #$30
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 #$00 : STA $4300 ; set DMA transfer direction A -> B, bus A auto increment, single-byte mode
LDA #$80 : STA $4301 ; set bus B source to WRAM register
LDA #$00 : STA $2181 ; set WRAM register source address
LDA #$65 : STA $2182
LDA #$7F : STA $2183
STZ $4302 ; set bus A destination address to SRAM
LDA #$05 : STA $4303
LDA #$70 : STA $4304
LDA #$00 : STA $4305 ; set transfer size to 0xB00
LDA #$0B : STA $4306 ; STZ $4307
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
REP #$30
PLA
STA $7EC00D ; what we wrote over
RTL
;--------------------------------------------------------------------------------
CopyExtendedWRAMSaveFileToSRAM:
PHA
PHB
SEP #$30
LDA #$00 : PHA : PLB
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 #$00 : STA $2181 ; set WRAM register source address
LDA #$65 : STA $2182
LDA #$7F : STA $2183
STZ $4302 ; set bus A destination address to SRAM
LDA #$05 : STA $4303
LDA #$70 : STA $4304
LDA #$00 : STA $4305 ; set transfer size to 0xB00
LDA #$0B : STA $4306 ; STZ $4307
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
REP #$30
PLB
PLA
LDX.w #$0000 : TXA ; what we wrote over
RTL