108 lines
2.3 KiB
Go
108 lines
2.3 KiB
Go
package izapple2
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/*
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MultiROM card for Apple II
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See: https://www.applefritter.com/content/multiple-image-rom-card
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-------
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28C256 (Also for 27256 on Rev 1.1 cards)
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-------
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0000-07FF - CPM boot (User 2) Bank 3
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0800-0FFF - Freeze (User 3) Bank 2
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1000-37FF - IntBasic including programmers aid BankBasic 0
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3800-3FFF - Monitor Bank 6
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4000-47FF - Lockbuster (User 1) Bank 4
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4800-4FFF - Dead boot diagnostic Bank 5
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5000-77FF - Applesoft BankBasic 1
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7800-7FFF - Autostart Bank 7
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*/
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// MultiRomCard represents a Multiple Image ROM Card
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type MultiRomCard struct {
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cardBase
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rom []uint8
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basicBank int
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f8Bank int
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}
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func newMultiRomCardBuilder() *cardBuilder {
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return &cardBuilder{
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name: "MultiROM",
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description: "Multiple Image ROM card",
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defaultParams: &[]paramSpec{
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{"rom", "ROM file to load", "<internal>/MultiRom(SP boot)-Prog aid-28C256.BIN"},
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{"basic", "Bank for D000 to F7FF", "1"},
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{"bank", "Bank for F8", "7"}},
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buildFunc: func(params map[string]string) (Card, error) {
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var c MultiRomCard
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var err error
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c.basicBank, err = paramsGetInt(params, "basic")
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if err != nil {
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return nil, err
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}
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c.f8Bank, err = paramsGetInt(params, "bank")
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if err != nil {
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return nil, err
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}
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romFile := paramsGetPath(params, "rom")
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data, _, err := LoadResource(romFile)
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if err != nil {
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return nil, err
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}
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c.rom = data
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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 *MultiRomCard) assign(a *Apple2, slot int) {
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c.cardBase.assign(a, slot)
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a.mmu.inhibitROM(c)
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}
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func (c *MultiRomCard) translateAddress(address uint16) uint16 {
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var baseAddress uint16
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// Basic part
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if address < 0xf800 {
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switch c.basicBank {
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case 0:
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baseAddress = 0x1000
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default:
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baseAddress = 0x5000
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}
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return address - 0xd000 + baseAddress
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}
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// F8 part
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switch c.f8Bank {
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case 2:
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baseAddress = 0x0800
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case 3:
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baseAddress = 0x0000
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case 4:
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baseAddress = 0x4000
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case 5:
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baseAddress = 0x4800
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case 6:
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baseAddress = 0x3800
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default:
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baseAddress = 0x7800
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}
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return address - 0xf800 + baseAddress
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}
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func (c *MultiRomCard) peek(address uint16) uint8 {
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return c.rom[c.translateAddress(address)]
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}
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func (c *MultiRomCard) poke(address uint16, value uint8) {
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// Nothing
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}
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