74 lines
1.9 KiB
Go
74 lines
1.9 KiB
Go
package izapple2
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import "fmt"
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/*
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Terence Boldt's ProDOS-ROM-Drive: A bootable 1 MB solid state disk for Apple ][ computers
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Emulates version 4.0+
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See:
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https://github.com/tjboldt/ProDOS-ROM-Drive
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https://github.com/Alex-Kw/ProDOS-ROM-Drive-Images
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*/
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// CardMemoryExpansion is a Memory Expansion card
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type CardProDOSRomDrive struct {
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cardBase
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address uint16
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data []uint8
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}
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const proDOSRomDriveMask = 0xf_ffff // 1 MB mask
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func newCardProDOSRomDriveBuilder() *cardBuilder {
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return &cardBuilder{
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name: "ProDOS ROM Drive",
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description: "A bootable 1 MB solid state disk by Terence Boldt",
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defaultParams: &[]paramSpec{
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//{"image", "ROM image with the ProDOS volume", "https://github.com/tjboldt/ProDOS-ROM-Drive/raw/v4.0/Firmware/GamesWithFirmware.po"},
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{"image", "ROM image with the ProDOS volume", "https://github.com/Alex-Kw/ProDOS-ROM-Drive-Images/raw/main/ProDOS_2.4.3_TJ.po"},
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},
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buildFunc: func(params map[string]string) (Card, error) {
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image := paramsGetPath(params, "image")
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if image == "" {
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return nil, fmt.Errorf("image required for the ProDOS ROM drive")
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}
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data, _, err := LoadResource(image)
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if err != nil {
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return nil, err
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}
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var c CardProDOSRomDrive
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c.data = data
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c.loadRom(data[0x300:0x400], cardRomSimple)
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return &c, nil
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},
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}
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}
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func (c *CardProDOSRomDrive) assign(a *Apple2, slot int) {
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// Set pointer position
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c.addCardSoftSwitchW(0, func(value uint8) {
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c.address = uint16(value) | c.address&0xff00
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}, "LATCHLO")
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c.addCardSoftSwitchW(1, func(value uint8) {
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c.address = uint16(value)<<8 | c.address&0xff
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}, "LATCHHI")
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// Read data
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for i := uint8(0x0); i <= 0xf; i++ {
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iCopy := i
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c.addCardSoftSwitchR(iCopy, func() uint8 {
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offset := uint32(c.address)<<4 + uint32(iCopy)
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offset &= proDOSRomDriveMask
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return c.data[offset]
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}, fmt.Sprintf("READ%X", iCopy))
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}
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c.cardBase.assign(a, slot)
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}
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