izapple2/apple2/softSwitches2e.go

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package apple2
const (
ioFlagIntCxRom uint8 = 0x15
ioFlagSlotC3Rom uint8 = 0x17
ioFlag80Store uint8 = 0x18
ioFlagAltChar uint8 = 0x19
ioFlag80Col uint8 = 0x1F
)
2019-02-24 14:05:50 +00:00
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.isSoftSwitchExtActive(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.isSoftSwitchExtActive(ioFlagIntCxRom) {
return // Ignore if allt the Apple2 shadow ROM is active
}
mmu := io.apple2.mmu
mmu.setPage(0xC3, &mmu.physicalROMe[3])
}