Video 7 RGB doesn't have NTSC artifacts on the mixed mode text

screen/snapshots.go

@@ -51,6 +51,7 @@ func snapshotByMode(vs VideoSource, videoMode uint16, screenMode int) *image.RGB
 	mixMode := videoMode & VideoMixTextMask
 	isSecondPage := (videoMode & VideoSecondPage) != 0
 	isAltText := (videoMode & VideoAltText) != 0
+	isRGBCard := (videoMode & VideoRGBCard) != 0
 
 	var lightColor color.Color = color.White
 	if screenMode == ScreenModeGreen {
@@ -99,7 +100,7 @@ func snapshotByMode(vs VideoSource, videoMode uint16, screenMode int) *image.RGB
 
 	if mixMode != 0 {
 		var bottom *image.RGBA
-		applyNTSCFilter := screenMode != ScreenModeGreen
+		applyNTSCFilter := screenMode != ScreenModeGreen && !isRGBCard
 		switch mixMode {
 		case VideoMixText40:
 			bottom = snapshotText40(vs, isSecondPage, isAltText, lightColor)

screen/videoSource.go

@@ -35,6 +35,7 @@ const (
 	VideoModifiersMask uint16 = 0xf000
 	VideoSecondPage    uint16 = 0x1000
 	VideoAltText       uint16 = 0x2000
+	VideoRGBCard       uint16 = 0x4000
 )
 
 // VideoSource provides the info to build the video output

videoSourceImpl.go

@@ -89,6 +89,9 @@ func (a *Apple2) GetCurrentVideoMode() uint16 {
 	if isAltText {
 		mode |= screen.VideoAltText
 	}
+	if isRGBCard {
+		mode |= screen.VideoRGBCard
+	}
 
 	return mode
 }