103 lines
3.8 KiB
Go
103 lines
3.8 KiB
Go
package apple2
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/*
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See:
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https://www.apple.asimov.net/documentation/hardware/machines/APPLE%20IIe%20Auxiliary%20Memory%20Softswitches.pdf
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*/
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const (
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ioFlagRamRd uint8 = 0x13
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ioFlagRamWrt uint8 = 0x14
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ioFlagIntCxRom uint8 = 0x15
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ioFlagAltZp uint8 = 0x16
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ioFlagSlotC3Rom uint8 = 0x17
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ioFlag80Store uint8 = 0x18
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ioFlagAltChar uint8 = 0x1E
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ioFlag80Col uint8 = 0x1F
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// ??? ioVertBlank uin8 = 0x19
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)
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func addApple2ESoftSwitches(io *ioC0Page) {
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// New MMU read softswithes
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io.addSoftSwitchW(0x02, getSoftSwitchExt(ioFlagRamRd, ssOff, nil), "RAMRDOFF")
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io.addSoftSwitchW(0x03, getSoftSwitchExt(ioFlagRamWrt, ssOn, nil), "RAMRDON")
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io.addSoftSwitchR(0x13, getStatusSoftSwitch(ioFlagRamWrt), "RAMRD")
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io.addSoftSwitchW(0x04, getSoftSwitchExt(ioFlagRamWrt, ssOff, nil), "RAMWRTOFF")
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io.addSoftSwitchW(0x05, getSoftSwitchExt(ioFlagRamWrt, ssOn, nil), "RAMWRTON")
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io.addSoftSwitchR(0x14, getStatusSoftSwitch(ioFlagRamWrt), "RAMWRT")
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io.addSoftSwitchW(0x06, getSoftSwitchExt(ioFlagIntCxRom, ssOff, softSwitchIntCxRomOff), "INTCXROMOFF")
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io.addSoftSwitchW(0x07, getSoftSwitchExt(ioFlagIntCxRom, ssOn, softSwitchIntCxRomOn), "INTCXROMON")
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io.addSoftSwitchR(0x15, getStatusSoftSwitch(ioFlagIntCxRom), "INTCXROM")
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io.addSoftSwitchW(0x08, getSoftSwitchExt(ioFlagAltZp, ssOff, nil), "ALTZPOFF")
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io.addSoftSwitchW(0x09, getSoftSwitchExt(ioFlagAltZp, ssOn, nil), "ALTZPON")
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io.addSoftSwitchR(0x16, getStatusSoftSwitch(ioFlagAltZp), "ALTZP")
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io.addSoftSwitchW(0x0A, getSoftSwitchExt(ioFlagSlotC3Rom, ssOff, softSwitchSlotC3RomOff), "SLOTC3ROMOFF")
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io.addSoftSwitchW(0x0B, getSoftSwitchExt(ioFlagSlotC3Rom, ssOn, softSwitchSlotC3RomOn), "SLOTC3ROMON")
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io.addSoftSwitchR(0x17, getStatusSoftSwitch(ioFlagSlotC3Rom), "SLOTC3ROM")
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// Previous read softswithes
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io.addSoftSwitchR(0x1A, getStatusSoftSwitch(ioFlagText), "TEXT")
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io.addSoftSwitchR(0x1B, getStatusSoftSwitch(ioFlagMixed), "MIXED")
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io.addSoftSwitchR(0x1C, getStatusSoftSwitch(ioFlagSecondPage), "PAGE2")
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io.addSoftSwitchR(0x1D, getStatusSoftSwitch(ioFlagHiRes), "HIRES")
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// New IOU read softswithes
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io.addSoftSwitchW(0x00, getSoftSwitchExt(ioFlag80Store, ssOff, nil), "80STOREOFF")
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io.addSoftSwitchW(0x01, getSoftSwitchExt(ioFlag80Store, ssOn, nil), "80STOREON")
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io.addSoftSwitchR(0x18, getStatusSoftSwitch(ioFlag80Store), "80STORE")
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io.addSoftSwitchW(0x0C, getSoftSwitchExt(ioFlag80Col, ssOff, nil), "80COLOFF")
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io.addSoftSwitchW(0x0D, getSoftSwitchExt(ioFlag80Col, ssOn, nil), "80COLON")
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io.addSoftSwitchR(0x1F, getStatusSoftSwitch(ioFlag80Col), "80COL")
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io.addSoftSwitchW(0x0E, getSoftSwitchExt(ioFlagAltChar, ssOff, nil), "ALTCHARSETOFF")
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io.addSoftSwitchW(0x0F, getSoftSwitchExt(ioFlagAltChar, ssOn, nil), "ALTCHARSETON")
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io.addSoftSwitchR(0x1E, getStatusSoftSwitch(ioFlagAltChar), "ALTCHARSET")
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// TOOD:
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// AKD read on 0x10
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// VBL read on 0x19
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//io.softSwitchesData[ioFlagAltChar] = ssOn // Not sure about this.
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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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//io.apple2.mmu.setPagesRead(0xc1, 0xcf, io.apple2.mmu.physicalROMe)
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}
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func softSwitchIntCxRomOff(io *ioC0Page) {
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// TODO restore all the ROM from the slots for 0xc1 to 0xc7
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//io.apple2.mmu.setPages(0xc1, 0xc7, nil)
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}
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func softSwitchSlotC3RomOn(io *ioC0Page) {
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// TODO restore the slot 3 ROM
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//io.apple2.mmu.setPages(0xc3, 0xc3, nil)
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}
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func softSwitchSlotC3RomOff(io *ioC0Page) {
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//io.apple2.mmu.setPagesRead(0xc3, 0xc3, io.apple2.mmu.physicalROMe)
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}
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// TODO: apply state after persistance load
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