package apple2 const ( ioFlagIntCxRom uint8 = 0x15 ioFlagSlotC3Rom uint8 = 0x17 ioFlag80Store uint8 = 0x18 ioFlagAltChar uint8 = 0x19 ioFlag80Col uint8 = 0x1F ) func addApple2ESoftSwitches(io *ioC0Page) { io.addSoftSwitchW(0x00, getSoftSwitchExt(ioFlag80Store, ssOff, nil)) io.addSoftSwitchW(0x01, getSoftSwitchExt(ioFlag80Store, ssOn, nil)) io.addSoftSwitchW(0x06, getSoftSwitchExt(ioFlagIntCxRom, ssOff, softSwitchIntCxRomOff)) io.addSoftSwitchW(0x07, getSoftSwitchExt(ioFlagIntCxRom, ssOn, softSwitchIntCxRomOn)) io.addSoftSwitchW(0x0A, getSoftSwitchExt(ioFlagSlotC3Rom, ssOff, softSwitchSlotC3RomOff)) io.addSoftSwitchW(0x0B, getSoftSwitchExt(ioFlagSlotC3Rom, ssOn, softSwitchSlotC3RomOn)) io.addSoftSwitchW(0x0C, getSoftSwitchExt(ioFlag80Col, ssOff, nil)) io.addSoftSwitchW(0x0D, getSoftSwitchExt(ioFlag80Col, ssOn, nil)) io.addSoftSwitchW(0x0E, getSoftSwitchExt(ioFlagAltChar, ssOff, nil)) io.addSoftSwitchW(0x0F, getSoftSwitchExt(ioFlagAltChar, ssOn, nil)) io.softSwitchesData[ioFlagAltChar] = ssOn // Not sure about this. io.addSoftSwitchR(0x15, getStatusSoftSwitch(ioFlagIntCxRom)) io.addSoftSwitchR(0x17, getStatusSoftSwitch(ioFlagSlotC3Rom)) io.addSoftSwitchR(0x18, getStatusSoftSwitch(ioFlag80Store)) io.addSoftSwitchR(0x1C, getStatusSoftSwitch(ioFlagSecondPage)) io.addSoftSwitchR(0x1F, getStatusSoftSwitch(ioFlag80Col)) } type softSwitchExtAction func(io *ioC0Page) func getSoftSwitchExt(ioFlag uint8, dstValue uint8, action softSwitchExtAction) softSwitchW { return func(io *ioC0Page, _ uint8) { currentValue := io.softSwitchesData[ioFlag] if currentValue == dstValue { return // Already switched, ignore } if action != nil { action(io) } io.softSwitchesData[ioFlag] = dstValue } } func softSwitchIntCxRomOn(io *ioC0Page) { mmu := io.apple2.mmu for i := uint8(1); i < 16; i++ { mmu.setPage(uint8(0xc0+i), &mmu.physicalROMe[i]) } } func softSwitchIntCxRomOff(io *ioC0Page) { // TODO restore all the ROM from the slot for 0xc1 to 0xc7 mmu := io.apple2.mmu for i := 1; i < 16; i++ { mmu.setPage(uint8(0xc0+i), &mmu.unassignedExpansionROM[i]) } } func softSwitchSlotC3RomOn(io *ioC0Page) { if io.isSoftSwitchActive(ioFlagIntCxRom) { return // Ignore if allt the Apple2 shadow ROM is active } // TODO restore the slot 3 ROM mmu := io.apple2.mmu mmu.setPage(0xC3, &mmu.unassignedExpansionROM[3]) } func softSwitchSlotC3RomOff(io *ioC0Page) { if io.isSoftSwitchActive(ioFlagIntCxRom) { return // Ignore if allt the Apple2 shadow ROM is active } mmu := io.apple2.mmu mmu.setPage(0xC3, &mmu.physicalROMe[3]) }