#12 Restore F6 and F12. F6 to switch mono green/NTSC modes

frontend/a2sdl/main.go

@@ -94,10 +94,10 @@ func sdlRun(a *izapple2.Apple2) {
 				img = screen.SnapshotCharacterGenerator(a, kp.showAltText)
 				window.SetTitle(fmt.Sprintf("%v character map", a.Name))
 			} else if kp.showPages {
-				img = screen.SnapshotParts(a, screen.ScreenModeNTSC)
+				img = screen.SnapshotParts(a, kp.screenMode)
 				window.SetTitle(fmt.Sprintf("%v %v %vx%v", a.Name, screen.VideoModeName(a), img.Rect.Dx()/2, img.Rect.Dy()/2))
 			} else {
-				img = screen.Snapshot(a, screen.ScreenModeNTSC)
+				img = screen.Snapshot(a, kp.screenMode)
 			}
 			if img != nil {
 				surface, err := sdl.CreateRGBSurfaceFrom(unsafe.Pointer(&img.Pix[0]),

frontend/a2sdl/sdlKeyboard.go

@@ -15,12 +15,15 @@ type sdlKeyboard struct {
 	showPages   bool
 	showCharGen bool
 	showAltText bool
+	screenMode  int
 }
 
 func newSDLKeyBoard(a *izapple2.Apple2) *sdlKeyboard {
 	var k sdlKeyboard
 	k.a = a
 	k.keyChannel = izapple2.NewKeyboardChannel(a)
+
+	k.screenMode = screen.ScreenModeNTSC
 	return &k
 }
 
@@ -98,6 +101,12 @@ func (k *sdlKeyboard) putKey(keyEvent *sdl.KeyboardEvent) {
 		} else {
 			k.a.SendCommand(izapple2.CommandToggleSpeed)
 		}
+	case sdl.K_F6:
+		if k.screenMode == screen.ScreenModeNTSC {
+			k.screenMode = screen.ScreenModeGreen
+		} else {
+			k.screenMode = screen.ScreenModeNTSC
+		}
 	case sdl.K_F7:
 		k.showPages = !k.showPages
 	case sdl.K_F9:
@@ -113,12 +122,13 @@ func (k *sdlKeyboard) putKey(keyEvent *sdl.KeyboardEvent) {
 	case sdl.K_F11:
 		k.a.SendCommand(izapple2.CommandToggleCPUTrace)
 	case sdl.K_F12:
+		fallthrough
 	case sdl.K_PRINTSCREEN:
 		err := screen.SaveSnapshot(k.a, screen.ScreenModeNTSC, "snapshot.png")
 		if err != nil {
 			fmt.Printf("Error saving snapshoot: %v.\n.", err)
 		} else {
-			fmt.Println("Saving snapshot")
+			fmt.Println("Saving snapshot 'snapshot.png'")
 		}
 	case sdl.K_PAUSE:
 		k.a.SendCommand(izapple2.CommandPauseUnpauseEmulator)