MultiROM card by davidm in applefritter

cardBuilder.go

@@ -41,6 +41,7 @@ func getCardFactory() map[string]*cardBuilder {
 	cardFactory["softswitchlogger"] = newCardLoggerBuilder()
 	cardFactory["memexp"] = newCardMemoryExpansionBuilder()
 	cardFactory["mouse"] = newCardMouseBuilder()
+	cardFactory["multirom"] = newMultiRomCardBuilder()
 	cardFactory["parallel"] = newCardParallelPrinterBuilder()
 	cardFactory["saturn"] = newCardSaturnBuilder()
 	cardFactory["smartport"] = newCardSmartPortStorageBuilder()

cardMultiRom.go

@@ -0,0 +1,111 @@
+package izapple2
+
+/*
+	MultiROM card for Apple II
+
+See: https://www.applefritter.com/content/multiple-image-rom-card
+
+
+-------
+28C256  (Also for 27256 on Rev 1.1 cards)
+-------
+0000-07FF - CPM boot   (User 2)                  Bank 3
+0800-0FFF - Freeze     (User 3)                  Bank 2
+1000-37FF - IntBasic including programmers aid	 BankBasic 0
+3800-3FFF - Monitor						         Bank 6
+4000-47FF - Lockbuster (User 1)                  Bank 4
+4800-4FFF - Dead boot diagnostic                 Bank 5
+5000-77FF - Applesoft                            BankBasic 1
+7800-7FFF - Autostart                            Bank 7
+
+
+*/
+
+// MultiRomCard represents a Multiple Image ROM Card
+type MultiRomCard struct {
+	cardBase
+	rom       []uint8
+	basicBank int
+	f8Bank    int
+}
+
+func newMultiRomCardBuilder() *cardBuilder {
+	return &cardBuilder{
+		name:        "MultiROM",
+		description: "Multiple Image ROM card.",
+		defaultParams: &[]paramSpec{
+			{"rom", "ROM file to load", "<internal>/MultiRom(SP boot)-Prog aid-28C256.BIN"},
+			{"basic", "Bank for D000 to F7FF", "1"},
+			{"bank", "Bank for F8", "7"}},
+		buildFunc: func(params map[string]string) (Card, error) {
+			var c MultiRomCard
+			var err error
+			c.basicBank, err = paramsGetInt(params, "basic")
+			if err != nil {
+				return nil, err
+			}
+			c.f8Bank, err = paramsGetInt(params, "bank")
+			if err != nil {
+				return nil, err
+			}
+
+			romFile := paramsGetPath(params, "rom")
+			data, _, err := LoadResource(romFile)
+			if err != nil {
+				return nil, err
+			}
+
+			c.rom = data
+			return &c, nil
+		},
+	}
+}
+
+func (c *MultiRomCard) assign(a *Apple2, slot int) {
+	c.cardBase.assign(a, slot)
+	a.mmu.inhibitROM(c)
+}
+
+func (c *MultiRomCard) translateAddress(address uint16) uint16 {
+	var baseAddress uint16
+	// Basic part
+	if address < 0xf800 {
+		switch c.basicBank {
+		case 0:
+			baseAddress = 0x1000
+		default:
+			baseAddress = 0x5000
+		}
+		return address - 0xd000 + baseAddress
+	}
+
+	// F8 part
+
+	switch c.f8Bank {
+	case 2:
+		baseAddress = 0x0800
+	case 3:
+		baseAddress = 0x0000
+	case 4:
+		baseAddress = 0x4000
+	case 5:
+		baseAddress = 0x4800
+	case 6:
+		baseAddress = 0x3800
+	default:
+		baseAddress = 0x7800
+	}
+	return address - 0xf800 + baseAddress
+}
+
+func (c *MultiRomCard) peek(address uint16) uint8 {
+	return c.rom[c.translateAddress(address)]
+}
+
+func (c *MultiRomCard) poke(address uint16, value uint8) {
+	// Nothing
+}
+
+func (c *MultiRomCard) setBase(base uint16) {
+	// Nothing
+}