Adding a --forceCaps flag to ensure all keypresses are in caps. Particularly useful if you are multitasking!

apple2.go

@@ -24,6 +24,7 @@ type Apple2 struct {
 	showSpeed           bool
 	paused              bool
 	traceMLI            *traceProDOS
+	forceCaps           bool
 }
 
 const (
@@ -137,6 +138,15 @@ func (a *Apple2) IsProfiling() bool {
 	return a.profile
 }
 
+func (a *Apple2) setForceCaps(value bool) {
+	a.forceCaps = value
+}
+
+// IsForceCaps returns true when all letters are forced to upper case
+func (a *Apple2) IsForceCaps() bool {
+	return a.forceCaps
+}
+
 const (
 	// CommandToggleSpeed toggles cpu speed between full speed and actual Apple II speed
 	CommandToggleSpeed = iota + 1

apple2main.go

@@ -123,6 +123,10 @@ func MainApple() *Apple2 {
 		"traceMLI",
 		false,
 		"dump to the console the calls to ProDOS machine language interface calls to $BF00")
+	forceCaps := flag.Bool(
+		"forceCaps",
+		false,
+		"force all letters to be uppercased (no need for caps lock!)")
 
 	flag.Parse()
 
@@ -144,6 +148,7 @@ func MainApple() *Apple2 {
 	a.io.setTraceRegistrations(*traceSSReg)
 	a.io.setPanicNotImplemented(*panicSS)
 	a.setProfiling(*profile)
+	a.setForceCaps(*forceCaps)
 
 	var charGenMap charColumnMap
 	initialCharGenPage := 0

keyboard.go

@@ -1,5 +1,7 @@
 package izapple2
 
+import "unicode"
+
 // KeyboardProvider provides a keyboard implementation
 type KeyboardProvider interface {
 	GetKey(strobe bool) (key uint8, ok bool)
@@ -31,6 +33,9 @@ func (k *KeyboardChannel) PutText(text string) {
 func (k *KeyboardChannel) PutRune(ch rune) {
 	// We will use computed text only for printable ASCII chars
 	if ch >= ' ' && ch <= '~' {
+		if k.a.IsForceCaps() && ch >= 'a' && ch <= 'z' {
+			ch = unicode.ToUpper(ch)
+		}
 		k.PutChar(uint8(ch))
 	}
 }