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