mirror of
https://github.com/ivanizag/izapple2.git
synced 2025-01-20 01:30:23 +00:00
75 lines
1.7 KiB
Go
75 lines
1.7 KiB
Go
package izapple2
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/*
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Copam BASE64A adaptation.
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*/
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const (
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// There are 6 ROM chips. Each can have 4Kb or 8Kb. They can fill
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// 2 or 4 banks with 2kb windows.
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base64aRomBankSize = 12 * 1024
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base64aRomBankCount = 4
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base64aRomWindowSize = 2 * 1024
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base64aRomChipCount = 6
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)
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func loadBase64aRom(a *Apple2) error {
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return loadMultiPageRom(a, []string{
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"<internal>/BASE64A_D0.BIN",
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"<internal>/BASE64A_D8.BIN",
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"<internal>/BASE64A_E0.BIN",
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"<internal>/BASE64A_E8.BIN",
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"<internal>/BASE64A_F0.BIN",
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"<internal>/BASE64A_F8.BIN",
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})
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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, buildNotImplementedSoftSwitchW(io), "80COLOFF")
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io.addSoftSwitchW(0x0E, buildNotImplementedSoftSwitchW(io), "ALTCHARSETOFF")
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// ROM pagination softswitches. They use the annunciator 0 and 1
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mmu := io.apple2.mmu
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io.addSoftSwitchRW(0x58, func() uint8 {
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if rom, ok := mmu.physicalROM.(*memoryRangeROM); ok {
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p := rom.getPage()
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rom.setPage(p & 2)
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}
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return 0
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}, "ANN0OFF-ROM")
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io.addSoftSwitchRW(0x59, func() uint8 {
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if rom, ok := mmu.physicalROM.(*memoryRangeROM); ok {
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p := rom.getPage()
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rom.setPage(p | 1)
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}
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return 0
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}, "ANN0ON-ROM")
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io.addSoftSwitchRW(0x5A, func() uint8 {
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if rom, ok := mmu.physicalROM.(*memoryRangeROM); ok {
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p := rom.getPage()
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rom.setPage(p & 1)
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}
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return 0
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}, "ANN1OFF-ROM")
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io.addSoftSwitchRW(0x5B, func() uint8 {
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if rom, ok := mmu.physicalROM.(*memoryRangeROM); ok {
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p := rom.getPage()
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rom.setPage(p | 2)
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}
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return 0
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}, "ANN1ON-ROM")
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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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