47 lines
986 B
Go
47 lines
986 B
Go
package apple2
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import (
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"github.com/ivanizag/apple2/core6502"
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)
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/*
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Copam BASE64A adaptation.
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*/
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// newBase64a instantiates an apple2
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func newBase64a() *Apple2 {
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var a Apple2
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a.Name = "Base 64A"
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a.mmu = newMemoryManager(&a)
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a.cpu = core6502.NewNMOS6502(a.mmu)
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a.io = newIoC0Page(&a)
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addApple2SoftSwitches(a.io)
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addBase64aSoftSwitches(a.io)
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return &a
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}
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func addBase64aSoftSwitches(io *ioC0Page) {
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// Other softswitches, not implemented but called from the ROM
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io.addSoftSwitchW(0x0C, notImplementedSoftSwitchW, "80COLOFF")
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io.addSoftSwitchW(0x0E, notImplementedSoftSwitchW, "ALTCHARSETOFF")
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// Write on the speaker. That is a double access and should do nothing
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// but works somehow on the BASE64A
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io.addSoftSwitchW(0x30, func(io *ioC0Page, value uint8) {
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speakerSoftSwitch(io)
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}, "SPEAKER")
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}
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func charGenColumnsMapBase64a(column int) int {
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bit := column + 2
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// Weird positions
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if column == 6 {
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bit = 2
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} else if column == 0 {
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bit = 1
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}
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return bit
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}
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