mirror of
https://github.com/freewilll/apple2-go.git
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100c44cb11
With this, DOS3.3 is booting
81 lines
2.0 KiB
Go
81 lines
2.0 KiB
Go
package main
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import (
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"flag"
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"github.com/hajimehoshi/ebiten"
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"mos6502go/cpu"
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"mos6502go/keyboard"
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"mos6502go/mmu"
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"mos6502go/utils"
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"mos6502go/video"
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)
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const (
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screenSizeFactor = 1 // Factor by which the whole screen is resized
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textVideoMemory = 0x400 // Base location of page 1 text video memory
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flashFrames = 8 // Number of frames when FLASH mode is toggled
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)
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var showInstructions *bool
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var disableFirmwareWait *bool
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var resetKeysDown bool
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var breakAddress *uint16
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func reset() {
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bootVector := 0xfffc
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lsb := mmu.PageTable[bootVector>>8][bootVector&0xff] // TODO move readMemory to mmu
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msb := mmu.PageTable[(bootVector+1)>>8][(bootVector+1)&0xff]
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cpu.State.PC = uint16(lsb) + uint16(msb)<<8
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}
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// checkResetKeys check ctrl-alt-R has been pressed. Releasing the R does a warm reset
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func checkResetKeys() {
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if ebiten.IsKeyPressed(ebiten.KeyControl) && ebiten.IsKeyPressed(ebiten.KeyAlt) && ebiten.IsKeyPressed(ebiten.KeyR) {
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resetKeysDown = true
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} else if ebiten.IsKeyPressed(ebiten.KeyControl) && ebiten.IsKeyPressed(ebiten.KeyAlt) && !ebiten.IsKeyPressed(ebiten.KeyR) && resetKeysDown {
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resetKeysDown = false
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reset()
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} else {
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resetKeysDown = false
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}
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}
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func update(screen *ebiten.Image) error {
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keyboard.Poll()
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checkResetKeys()
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cpu.Run(*showInstructions, breakAddress, *disableFirmwareWait, 1024000/60)
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return video.DrawTextScreen(screen)
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}
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func main() {
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showInstructions = flag.Bool("show-instructions", false, "Show instructions code while running")
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disableFirmwareWait = flag.Bool("disable-wait", false, "Ignore JSRs to firmware wait at $FCA8")
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breakAddressString := flag.String("break", "", "Break on address")
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diskImage := flag.String("image", "", "Disk Image")
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flag.Parse()
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breakAddress = utils.DecodeCmdLineAddress(breakAddressString)
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cpu.InitInstructionDecoder()
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mmu.InitRAM()
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mmu.InitApple2eROM()
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mmu.InitIO()
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if *diskImage != "" {
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mmu.ReadDiskImage(*diskImage)
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}
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cpu.Init()
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keyboard.Init()
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video.Init()
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reset()
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ebiten.Run(update, 280*screenSizeFactor, 192*screenSizeFactor, 2, "Apple //e")
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}
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