126 lines
4.4 KiB
Go
126 lines
4.4 KiB
Go
package apple2
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const (
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ioDataKeyboard uint8 = 0x10
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ioFlagText 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 // On Copam Electronics Base-64A this is used to bank swith the ROM
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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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io.addSoftSwitchRW(0x00, getKeySoftSwitch) // Keyboard
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io.addSoftSwitchRW(0x10, strobeKeyboardSoftSwitch) // Keyboard Strobe
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io.addSoftSwitchR(0x20, notImplementedSoftSwitchR) // Cassette Output
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io.addSoftSwitchR(0x30, getSpeakerSoftSwitch) // Speaker
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io.addSoftSwitchR(0x40, notImplementedSoftSwitchR) // 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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io.addSoftSwitchRW(0x50, getSoftSwitch(ioFlagText, false))
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io.addSoftSwitchRW(0x51, getSoftSwitch(ioFlagText, true))
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io.addSoftSwitchRW(0x52, getSoftSwitch(ioFlagMixed, false))
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io.addSoftSwitchRW(0x53, getSoftSwitch(ioFlagMixed, true))
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io.addSoftSwitchRW(0x54, getSoftSwitch(ioFlagSecondPage, false))
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io.addSoftSwitchRW(0x55, getSoftSwitch(ioFlagSecondPage, true))
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io.addSoftSwitchRW(0x56, getSoftSwitch(ioFlagHiRes, false))
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io.addSoftSwitchRW(0x57, getSoftSwitch(ioFlagHiRes, true))
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io.addSoftSwitchRW(0x58, getSoftSwitch(ioFlagAnnunciator0, false))
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io.addSoftSwitchRW(0x59, getSoftSwitch(ioFlagAnnunciator0, true))
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io.addSoftSwitchRW(0x5a, getSoftSwitch(ioFlagAnnunciator1, false))
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io.addSoftSwitchRW(0x5b, getSoftSwitch(ioFlagAnnunciator1, true))
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io.addSoftSwitchRW(0x5c, getSoftSwitch(ioFlagAnnunciator2, false))
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io.addSoftSwitchRW(0x5d, getSoftSwitch(ioFlagAnnunciator2, true))
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io.addSoftSwitchRW(0x5e, getSoftSwitch(ioFlagAnnunciator3, false))
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io.addSoftSwitchRW(0x5f, getSoftSwitch(ioFlagAnnunciator3, true))
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io.addSoftSwitchR(0x60, notImplementedSoftSwitchR) // Cassette Input
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io.addSoftSwitchR(0x61, getStatusSoftSwitch(ioFlagButton0))
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io.addSoftSwitchR(0x62, getStatusSoftSwitch(ioFlagButton1))
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io.addSoftSwitchR(0x63, getStatusSoftSwitch(ioFlagButton2))
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io.addSoftSwitchR(0x64, getStatusSoftSwitch(ioDataPaddle0))
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io.addSoftSwitchR(0x65, getStatusSoftSwitch(ioDataPaddle1))
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io.addSoftSwitchR(0x66, getStatusSoftSwitch(ioDataPaddle2))
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io.addSoftSwitchR(0x67, getStatusSoftSwitch(ioDataPaddle3))
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// The previous 8 softswitches are repeated
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io.addSoftSwitchR(0x68, notImplementedSoftSwitchR) // Cassette Input
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io.addSoftSwitchR(0x69, getStatusSoftSwitch(ioFlagButton0))
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io.addSoftSwitchR(0x6A, getStatusSoftSwitch(ioFlagButton1))
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io.addSoftSwitchR(0x6B, getStatusSoftSwitch(ioFlagButton2))
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io.addSoftSwitchR(0x6C, getStatusSoftSwitch(ioDataPaddle0))
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io.addSoftSwitchR(0x6D, getStatusSoftSwitch(ioDataPaddle1))
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io.addSoftSwitchR(0x6E, getStatusSoftSwitch(ioDataPaddle2))
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io.addSoftSwitchR(0x6F, getStatusSoftSwitch(ioDataPaddle3))
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io.addSoftSwitchR(0x70, notImplementedSoftSwitchR) // Game controllers reset
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}
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func notImplementedSoftSwitchR(*ioC0Page) uint8 {
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return 0
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}
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func notImplementedSoftSwitchW(*ioC0Page, uint8) {
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}
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func getStatusSoftSwitch(ioFlag uint8) softSwitchR {
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return func(io *ioC0Page) 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) softSwitchR {
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return func(io *ioC0Page) 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 getSpeakerSoftSwitch(io *ioC0Page) uint8 {
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if io.speaker != nil {
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io.speaker.Click(io.apple2.cpu.GetCycles())
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}
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return 0
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}
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func getKeySoftSwitch(io *ioC0Page) uint8 {
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strobed := (io.softSwitchesData[ioDataKeyboard] & (1 << 7)) == 0
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if io.keyboard != nil {
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if key, ok := io.keyboard.GetKey(strobed); ok {
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io.softSwitchesData[ioDataKeyboard] = key + (1 << 7)
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}
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}
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value := io.softSwitchesData[ioDataKeyboard]
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//fmt.Printf("Key $%02x, %v\n", value, strobed)
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return value
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}
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func strobeKeyboardSoftSwitch(io *ioC0Page) uint8 {
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result := io.softSwitchesData[ioDataKeyboard]
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//fmt.Printf("Strobe $%02x\n", result)
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io.softSwitchesData[ioDataKeyboard] &^= 1 << 7
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return result
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}
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