Character map roms initial support

apple2/characterGenerator.go

@@ -0,0 +1,73 @@
+package apple2
+
+import (
+	"bufio"
+	"fmt"
+	"os"
+)
+
+/*
+ See:
+ hhttps://mirrors.apple2.org.za/Apple%20II%20Documentation%20Project/Companies/Apple/Documentation/Apple%20Technical%20Information%20Library/a2til041.txt
+*/
+
+// CharacterGenerator represents the ROM wth the characters bitmaps
+type CharacterGenerator struct {
+	data []uint8
+}
+
+const (
+	rev7CharGenSize = 2048
+)
+
+// NewCharacterGenerator instantiates a new Character Generator with the rom on the file given
+func NewCharacterGenerator(filename string) *CharacterGenerator {
+	var cg CharacterGenerator
+	cg.load(filename)
+	return &cg
+}
+
+func (cg *CharacterGenerator) load(filename string) {
+	f, err := os.Open(filename)
+	if err != nil {
+		panic(err)
+	}
+	defer f.Close()
+
+	stats, statsErr := f.Stat()
+	if statsErr != nil {
+		panic(err)
+	}
+
+	size := stats.Size()
+	if size != rev7CharGenSize {
+		panic("Character ROM size not supported")
+	}
+	cg.data = make([]uint8, size)
+	buf := bufio.NewReader(f)
+	buf.Read(cg.data)
+}
+
+func (cg *CharacterGenerator) dumpChar(char uint8) {
+	base := int(char) * 8
+	fmt.Printf("Char: %v\n---------\n", char)
+	for i := 0; i < 8; i++ {
+		fmt.Print("|")
+		b := cg.data[base+i]
+		for j := 6; j >= 0; j-- {
+			if (b>>uint(j))&1 == 1 {
+				fmt.Print("#")
+			} else {
+				fmt.Print(" ")
+			}
+		}
+		fmt.Println("|")
+	}
+	fmt.Println("---------")
+}
+
+func (cg *CharacterGenerator) Dump() {
+	for i := 0; i < 256; i++ {
+		cg.dumpChar(uint8(i))
+	}
+}

apple2/ioC0Page.go

@@ -15,6 +15,7 @@ type ioC0Page struct {
 type softSwitchR func(io *ioC0Page) uint8
 type softSwitchW func(io *ioC0Page, value uint8)
 
+// KeyboardProvider declares the keyboard implementation requitements
 type KeyboardProvider interface {
 	GetKey(strobe bool) (key uint8, ok bool)
 }

apple2/softSwitches2.go

@@ -7,7 +7,7 @@ const (
 	ioFlagMixed        uint8 = 0x52
 	ioFlagSecondPage   uint8 = 0x54
 	ioFlagHiRes        uint8 = 0x56
-	ioFlagAnnunciator0 uint8 = 0x58
+	ioFlagAnnunciator0 uint8 = 0x58 // On Copam Electronics Base-64A this is used to bank swith the ROM
 	ioFlagAnnunciator1 uint8 = 0x5a
 	ioFlagAnnunciator2 uint8 = 0x5c
 	ioFlagAnnunciator3 uint8 = 0x5e

main.go

@@ -19,6 +19,10 @@ func main() {
 		"disk",
 		"../dos33.dsk",
 		"file to load on the first disk drive")
+	charRomFile := flag.String(
+		"charRom",
+		"apple2/romdumps/Apple2rev7CharGen.rom",
+		"rom file for the disk drive controller")
 	useSdl := flag.Bool(
 		"sdl",
 		true,
@@ -27,6 +31,11 @@ func main() {
 		"panicss",
 		false,
 		"panic if a not implemented softwtich is used")
+	dumpChars := flag.Bool(
+		"dumpChars",
+		false,
+		"shows the character map",
+	)
 	flag.Parse()
 
 	//romFile := "apple2/romdumps/Apple2.rom"
@@ -37,6 +46,12 @@ func main() {
 	//diskImage := "../Apex II - Apple II Diagnostic (v4.7-1986).DSK"
 	//diskImage := "../A2Diag.v4.1.SDK"
 
+	if *dumpChars {
+		cg := apple2.NewCharacterGenerator(*charRomFile)
+		cg.Dump()
+		return
+	}
+
 	log := false
 	a := apple2.NewApple2(*romFile, *panicSS)
 	a.AddDisk2(*disk2RomFile, *diskImage)