80 lines
2.1 KiB
Go
80 lines
2.1 KiB
Go
package izapple2
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import "fmt"
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/*
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Ralle Palaveev's ProDOS-Romcard3
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See:
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https://github.com/rallepaqlaveev/ProDOS-Romcard3
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Note that this card disables the C800-CFFF range only on writes to CFFF, not as most other cards that disable on reads and writes.
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*/
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// CardProDOSRomCard3 is a Memory Expansion card
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type CardProDOSRomCard3 struct {
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cardBase
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bank uint16
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data []uint8
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}
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func newCardProDOSRomCard3Builder() *cardBuilder {
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return &cardBuilder{
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name: "ProDOS ROM Card 3",
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description: "A bootable 4 MB ROM card by Ralle Palaveev",
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defaultParams: &[]paramSpec{
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{"image", "ROM image with the ProDOS volume", "https://github.com/rallepalaveev/ProDOS-Romcard3/raw/main/ProDOS-ROMCARD3_4MB_A2D.v1.4_v37.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 CardProDOSRomCard3
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c.data = data
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c.loadRom(data[0x200:0x300])
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c.romC8xx = &c
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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 *CardProDOSRomCard3) 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.bank = uint16(value) | c.bank&0xff00
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}, "BANKLO")
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c.addCardSoftSwitchW(1, func(value uint8) {
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c.bank = uint16(value)<<8 | c.bank&0xff
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}, "BANKHI")
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c.cardBase.assign(a, slot)
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}
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func (c *CardProDOSRomCard3) translateAddress(address uint16) int {
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// An address from 0xC800 to 0xCFFF is mapped to the corresponding bank of the ROM
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// There are 0x800 (2048) banks with 0x0800 (2048) bytes each
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offset := address - 0xC800
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pageAddress := int(c.bank&0x7FF) * 0x0800
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//fmt.Printf("CardProDOSRomCard3.translateAddress: address=%04X, bank=%04X, offset=%04X, pageAddress=%08X\n", address, c.bank, offset, pageAddress)
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return pageAddress + int(offset)
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}
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func (c *CardProDOSRomCard3) peek(address uint16) uint8 {
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return c.data[c.translateAddress(address)]
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}
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func (c *CardProDOSRomCard3) poke(address uint16, value uint8) {
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// Do nothing
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}
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