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Initial SRAM module check in

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Changes to save.asm and fileselect.asm to account for new WRAM buffer at
$7F6000 saved at $700500, length $1000.
Moves and additions noted at bottom of sram.asm, to be removed later.
This commit is contained in:
cassidy
2021-12-01 19:48:18 -05:00
parent df2bca00ee
commit fcd9b949e8
3 changed files with 592 additions and 19 deletions
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25
save.asm
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@@ -27,6 +27,11 @@ RTL
;--------------------------------------------------------------------------------
ClearExtendedWRAMSaveFile:
STA $7EF400, X ; what we wrote over
; STA $7F6000, X
STA $7F6100, X
STA $7F6200, X
STA $7F6300, X
STA $7F6400, X
STA $7F6500, X
STA $7F6600, X
STA $7F6700, X
@@ -55,16 +60,16 @@ CopyExtendedSaveFileToWRAM:
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
LDA #$00 : STA $2181 ; set WRAM register source address
LDA #$60 : STA $2182
LDA #$7F : STA $2183
STZ $4302 ; set bus A destination address to SRAM
LDA #$05 : STA $4303
LDA #$70 : STA $4304
LDA #$05 : STA $4303
LDA #$70 : STA $4304
LDA #$00 : STA $4305 ; set transfer size to 0xB00
LDA #$0B : STA $4306 ; STZ $4307
LDA #$10 : STA $4306 ; STZ $4307
LDA #$01 : STA $420B ; begin DMA transfer
;--------------------------------------------------------------------------------
@@ -97,15 +102,15 @@ CopyExtendedWRAMSaveFileToSRAM:
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
LDA #$00 : STA $2181 ; set WRAM register source address
LDA #$60 : 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 #$10 : STA $4305 ; set transfer size to 0xB00
LDA #$0B : STA $4306 ; STZ $4307
LDA #$01 : STA $420B ; begin DMA transfer