ProDOS ROM Drive Card

README.md

@@ -33,6 +33,7 @@ Portable emulator of an Apple II+ or //e. Written in Go.
   - Brain Board II
   - MultiROM card
   - Dan ][ Controller card
+  - ProDOS ROM card
 - Useful cards not emulating a real card
   - Bootable SmartPort / ProDOS card with the following smartport devices:
       - Block device (hard disks)
@@ -240,6 +241,7 @@ The available cards are:
   mouse: Mouse card implementation, does not emulate a real card, only the firmware behaviour
   multirom: Multiple Image ROM card
   parallel: Card to dump to a file what would be printed to a parallel printer
+  prodosrom: A bootable 1 MB solid state disk
   saturn: RAM card with 128Kb, it's like 8 language cards
   smartport: SmartPort interface card
   softswitchlogger: Card to log softswitch accesses

cardBuilder.go

@@ -51,6 +51,7 @@ func getCardFactory() map[string]*cardBuilder {
 	cardFactory["mouse"] = newCardMouseBuilder()
 	cardFactory["multirom"] = newMultiRomCardBuilder()
 	cardFactory["parallel"] = newCardParallelPrinterBuilder()
+	cardFactory["prodosrom"] = newCardProDOSRomDriveBuilder()
 	cardFactory["saturn"] = newCardSaturnBuilder()
 	cardFactory["smartport"] = newCardSmartPortStorageBuilder()
 	cardFactory["swyftcard"] = newCardSwyftBuilder()

cardProDOSRomDrive.go

@@ -0,0 +1,73 @@
+package izapple2
+
+import "fmt"
+
+/*
+ProDOS-ROM-Drive: A bootable 1 MB solid state disk for Apple ][ computers
+
+Emulates version 4.0+
+
+See:
+	https://github.com/tjboldt/ProDOS-ROM-Drive
+	https://github.com/Alex-Kw/ProDOS-ROM-Drive-Images
+
+*/
+
+// CardMemoryExpansion is a Memory Expansion card
+type CardProDOSRomDrive struct {
+	cardBase
+	address uint16
+	data    []uint8
+}
+
+const proDOSRomDriveMask = 0xf_ffff // 1 MB mask
+
+func newCardProDOSRomDriveBuilder() *cardBuilder {
+	return &cardBuilder{
+		name:        "ProDOS ROM Drive",
+		description: "A bootable 1 MB solid state disk",
+		defaultParams: &[]paramSpec{
+			//∫{"image", "ROM image with the ProDOS volume", "https://github.com/tjboldt/ProDOS-ROM-Drive/raw/v4.0/Firmware/GamesWithFirmware.po"},
+			{"image", "ROM image with the ProDOS volume", "https://github.com/Alex-Kw/ProDOS-ROM-Drive-Images/raw/main/ProDOS242_Beta5.po"},
+		},
+		buildFunc: func(params map[string]string) (Card, error) {
+			image := paramsGetPath(params, "image")
+			if image == "" {
+				return nil, fmt.Errorf("image required for the ProDOS ROM drive")
+			}
+
+			data, _, err := LoadResource(image)
+			if err != nil {
+				return nil, err
+			}
+
+			var c CardProDOSRomDrive
+			c.data = data
+			c.loadRom(data[0x300:0x400])
+			return &c, nil
+		},
+	}
+}
+
+func (c *CardProDOSRomDrive) assign(a *Apple2, slot int) {
+
+	// Set pointer position
+	c.addCardSoftSwitchW(0, func(value uint8) {
+		c.address = uint16(value) | c.address&0xff00
+	}, "LATCHLO")
+	c.addCardSoftSwitchW(1, func(value uint8) {
+		c.address = uint16(value)<<8 | c.address&0xff
+	}, "LATCHHI")
+
+	// Read data
+	for i := uint8(0x0); i <= 0xf; i++ {
+		iCopy := i
+		c.addCardSoftSwitchR(iCopy, func() uint8 {
+			offset := uint32(c.address)<<4 + uint32(iCopy)
+			offset &= proDOSRomDriveMask
+			return c.data[offset]
+		}, fmt.Sprintf("READ%X", iCopy))
+	}
+
+	c.cardBase.assign(a, slot)
+}

doc/usage.txt

@@ -66,6 +66,7 @@ The available cards are:
   mouse: Mouse card implementation, does not emulate a real card, only the firmware behaviour
   multirom: Multiple Image ROM card
   parallel: Card to dump to a file what would be printed to a parallel printer
+  prodosrom: A bootable 1 MB solid state disk
   saturn: RAM card with 128Kb, it's like 8 language cards
   smartport: SmartPort interface card
   softswitchlogger: Card to log softswitch accesses