108 lines
3.4 KiB
Go
108 lines
3.4 KiB
Go
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package apple2
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const (
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ioDataKeyboard uint8 = 0x10
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ioFlagGraphics uint8 = 0x50
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ioFlagMixed uint8 = 0x52
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ioFlagSecondPage uint8 = 0x54
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ioFlagHiRes uint8 = 0x56
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ioFlagAnnunciator0 uint8 = 0x58
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ioFlagAnnunciator1 uint8 = 0x5a
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ioFlagAnnunciator2 uint8 = 0x5c
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ioFlagAnnunciator3 uint8 = 0x5e
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ioDataCassette uint8 = 0x60
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ioFlagButton0 uint8 = 0x61
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ioFlagButton1 uint8 = 0x62
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ioFlagButton2 uint8 = 0x63
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ioDataPaddle0 uint8 = 0x64
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ioDataPaddle1 uint8 = 0x65
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ioDataPaddle2 uint8 = 0x66
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ioDataPaddle3 uint8 = 0x67
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)
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func addApple2SoftSwitches(io *ioC0Page) {
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ss := &io.softSwitches
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ss[0x00] = getKeySoftSwitch // Keyboard
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ss[0x10] = strobeKeyboardSoftSwitch // Keyboard Strobe
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ss[0x20] = notImplementedSoftSwitch // Cassette Output
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ss[0x30] = notImplementedSoftSwitch // Speaker
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ss[0x40] = notImplementedSoftSwitch // Game connector Strobe
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// Note: Some sources indicate that all these cover 16 positions
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// for read and write. But the Apple2e take over some of them, with
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// the prevention on acting only on writes.
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ss[0x50] = getSoftSwitch(ioFlagGraphics, false)
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ss[0x51] = getSoftSwitch(ioFlagGraphics, true)
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ss[0x52] = getSoftSwitch(ioFlagMixed, false)
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ss[0x53] = getSoftSwitch(ioFlagMixed, true)
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ss[0x54] = getSoftSwitch(ioFlagSecondPage, false)
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ss[0x55] = getSoftSwitch(ioFlagSecondPage, true)
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ss[0x56] = getSoftSwitch(ioFlagHiRes, false)
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ss[0x57] = getSoftSwitch(ioFlagHiRes, true)
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ss[0x58] = getSoftSwitch(ioFlagAnnunciator0, false)
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ss[0x59] = getSoftSwitch(ioFlagAnnunciator0, true)
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ss[0x5a] = getSoftSwitch(ioFlagAnnunciator1, false)
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ss[0x5b] = getSoftSwitch(ioFlagAnnunciator1, true)
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ss[0x5c] = getSoftSwitch(ioFlagAnnunciator2, false)
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ss[0x5d] = getSoftSwitch(ioFlagAnnunciator2, true)
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ss[0x5e] = getSoftSwitch(ioFlagAnnunciator3, false)
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ss[0x5f] = getSoftSwitch(ioFlagAnnunciator3, true)
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ss[0x60] = notImplementedSoftSwitch // Cassetter Input
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ss[0x61] = getStatusSoftSwitch(ioFlagButton0)
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ss[0x62] = getStatusSoftSwitch(ioFlagButton1)
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ss[0x63] = getStatusSoftSwitch(ioFlagButton2)
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ss[0x64] = getStatusSoftSwitch(ioDataPaddle0)
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ss[0x65] = getStatusSoftSwitch(ioDataPaddle1)
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ss[0x66] = getStatusSoftSwitch(ioDataPaddle2)
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ss[0x67] = getStatusSoftSwitch(ioDataPaddle3)
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ss[0x68] = ss[0x60]
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ss[0x69] = ss[0x61]
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ss[0x6A] = ss[0x62]
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ss[0x6B] = ss[0x63]
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ss[0x6C] = ss[0x64]
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ss[0x6D] = ss[0x65]
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ss[0x6E] = ss[0x66]
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ss[0x6F] = ss[0x67]
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ss[0x70] = notImplementedSoftSwitch // Game controllers reset
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}
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func notImplementedSoftSwitch(*ioC0Page, bool, uint8) uint8 {
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return 0
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}
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func getStatusSoftSwitch(ioFlag uint8) softSwitch {
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return func(io *ioC0Page, isWrite bool, value uint8) uint8 {
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return io.softSwitchesData[ioFlag]
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}
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}
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func getSoftSwitch(ioFlag uint8, isSet bool) softSwitch {
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return func(io *ioC0Page, isWrite bool, value uint8) uint8 {
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if isSet {
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io.softSwitchesData[ioFlag] = ssOn
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} else {
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io.softSwitchesData[ioFlag] = ssOff
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}
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return 0
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}
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}
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func getKeySoftSwitch(p *ioC0Page, _ bool, _ uint8) uint8 {
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strobed := (p.softSwitchesData[ioDataKeyboard] & (1 << 7)) == 0
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if strobed && p.keyboard != nil {
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if key, ok := p.keyboard.getKey(); ok {
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p.softSwitchesData[ioDataKeyboard] = key + (1 << 7)
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}
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}
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return p.softSwitchesData[ioDataKeyboard]
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}
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func strobeKeyboardSoftSwitch(p *ioC0Page, _ bool, _ uint8) uint8 {
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result := p.softSwitchesData[ioDataKeyboard]
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p.softSwitchesData[ioDataKeyboard] &^= 1 << 7
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return result
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}
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