Refactor inventory.asm
Refactor extended save data to use MVN Free small keys can be place in their own dungeon
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cassidoxa
109
save.asm
109
save.asm
@@ -14,11 +14,13 @@ WriteSaveChecksumAndBackup:
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STA.l InverseChecksumSRAM
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PHB
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LDA.w #$14FF ; \
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LDX.w #CartridgeSRAM&$FFFF ; | Copies $1500 bytes from beginning of cart SRAM to
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LDY.w #SaveBackupSRAM&$FFFF ; | $704000
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MVN !SRAMBank, !SRAMBank ; /
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LDA.w #$14FF ; \
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LDX.w #CartridgeSRAM ; | Copies $1500 bytes from beginning of cart SRAM to
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LDY.w #SaveBackupSRAM ; | $704000
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MVN !SRAMBank, !SRAMBank ; /
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PLB
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TDC
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TAX
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RTL
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;--------------------------------------------------------------------------------
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@@ -51,10 +53,10 @@ ValidateSRAM:
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TDC : STA.l FileValiditySRAM ; Delete save by way of zeroing validity marker
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BRA .goodchecksum : +
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PHB
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LDA.w #$14FF ; \
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LDX.w #SaveBackupSRAM&$FFFF ; | Copies $1500 bytes from backup on cart SRAM to
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LDY.w #CartridgeSRAM&$FFFF ; | main save location at $700000
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MVN !SRAMBank, !SRAMBank ; /
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LDA.w #$14FF ; \
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LDX.w #SaveBackupSRAM ; | Copies $1500 bytes from backup on cart SRAM to
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LDY.w #CartridgeSRAM ; | main save location at $700000
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MVN !SRAMBank, !SRAMBank ; /
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PLB
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.goodchecksum
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@@ -131,88 +133,23 @@ 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.w DMAP0 : PHA ; preserve DMA parameters
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LDA.w BBAD0 : PHA ; preserve DMA parameters
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LDA.w A1T0L : PHA ; preserve DMA parameters
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LDA.w A1T0H : PHA ; preserve DMA parameters
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LDA.w A1B0 : PHA ; preserve DMA parameters
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LDA.w DAS0L : PHA ; preserve DMA parameters
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LDA.w DAS0H : PHA ; preserve DMA parameters
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;--------------------------------------------------------------------------------
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STZ.w NMITIMEN ; Disable NMI, V/H, joypad
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STZ.w HDMAEN ; Disable HDMA
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LDA.b #$00 : STA.w DMAP0 ; set DMA transfer direction A -> B, bus A auto increment, single-byte mode
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LDA.b #$80 : STA.w BBAD0 ; set bus B source to WRAM register
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LDA.b #$00 : STA.w WMADDL ; set WRAM register source address
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LDA.b #$60 : STA.w WMADDH
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LDA.b #$7F : STA.w WMADDB
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STZ.w A1T0L ; set bus A destination address to SRAM
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LDA.b #$05 : STA.w A1T0H
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LDA.b #$70 : STA.w A1B0
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LDA.b #$00 : STA.w DAS0L ; set transfer size to 0x1000
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LDA.b #$10 : STA.w DAS0H ; STZ DAS0B
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LDA.b #$01 : STA.w MDMAEN ; begin DMA transfer
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LDA.b #$81 : STA.w NMITIMEN ; Re-enable NMI and joypad
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;--------------------------------------------------------------------------------
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PLA : STA.w DAS0H ; restore DMA parameters
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PLA : STA.w DAS0L ; restore DMA parameters
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PLA : STA.w A1B0 ; restore DMA parameters
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PLA : STA.w A1T0H ; restore DMA parameters
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PLA : STA.w A1T0L ; restore DMA parameters
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PLA : STA.w BBAD0 ; restore DMA parameters
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PLA : STA.w DMAP0 ; restore DMA parameters
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REP #$30
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PHB
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LDA.w #$0FFF
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LDX.w #ExtendedSaveDataSRAM
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LDY.w #ExtendedSaveDataWRAM
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MVN $7F, !SRAMBank
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PLB
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PLA
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STA.l $7EC00D ; what we wrote over
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STA.l $7EC00D ; What we wrote over. Keep this write last.
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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.b #$00 : PHA : PLB
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LDA.w DMAP0 : PHA ; preserve DMA parameters
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LDA.w BBAD0 : PHA ; preserve DMA parameters
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LDA.w A1T0L : PHA ; preserve DMA parameters
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LDA.w A1T0H : PHA ; preserve DMA parameters
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LDA.w A1B0 : PHA ; preserve DMA parameters
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LDA.w DAS0L : PHA ; preserve DMA parameters
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LDA.w DAS0H : PHA ; preserve DMA parameters
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;--------------------------------------------------------------------------------
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STZ.w NMITIMEN ; Disable NMI, V/H, joypad
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STZ.w HDMAEN ; Disable HDMA
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LDA.b #$80 : STA.w DMAP0 ; set DMA transfer direction B -> A, bus A auto increment, single-byte mode
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STA.w BBAD0 ; set bus B source to WRAM register
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LDA.b #$00 : STA.w WMADDL ; set WRAM register source address
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LDA.b #$60 : STA.w WMADDH
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LDA.b #$7F : STA.w WMADDB
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STZ.w A1T0L ; set bus A destination address to SRAM
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LDA.b #$05 : STA.w A1T0H
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LDA.b #$70 : STA.w A1B0
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LDA.b #$10 : STA.w DAS0L ; set transfer size to 0xB00
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LDA.b #$0B : STA.w DAS0H ; STZ DAS0B
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LDA.b #$01 : STA.w MDMAEN ; begin DMA transfer
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LDA.b #$81 : STA.w NMITIMEN; Re-enable NMI and joypad
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;--------------------------------------------------------------------------------
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PLA : STA.w DAS0H ; restore DMA parameters
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PLA : STA.w DAS0L ; restore DMA parameters
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PLA : STA.w A1B0 ; restore DMA parameters
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PLA : STA.w A1T0H ; restore DMA parameters
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PLA : STA.w A1T0L ; restore DMA parameters
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PLA : STA.w BBAD0 ; restore DMA parameters
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PLA : STA.w DMAP0 ; restore DMA parameters
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REP #$30
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LDA.w #$0FFF
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LDX.w #ExtendedSaveDataSRAM
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LDY.w #ExtendedSaveDataWRAM
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MVN !SRAMBank, $7F
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PLB
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PLA
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TDC
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TAX
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RTL
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