I have looked at the BOB4 from decade.net and it looks like their version only does white text on incoming video.

http://www.decadenet.com/bob4/bob4.html

I believe the STV chip was really designed for Menu setups on televisions etc, prior to digital sets, and does not to put color text overlays in incoming video, other chip maker versions also no colour, 1990-2000ish did the same, Maxim, Sanyo.

With digital sets it is now incorporated in a graphics chip onboard.


This is where you can change the character color, it will affect all characters using this routine, text and overlay.

DISPLAYCHAR:

WDATA = %0001010000000000 + STVCHAR

' 11 10 9 8 7654 3210
' WDATA = %0001 0 1 1 1 0000 0000 + STVCHAR

' bit 11 = character background 0 = disabled 1 = enabled

' bit 10 = red
' bit 09 = green
' bit 08 = blue

' 000 = black
' 001 = blue
' 010 = green
' 011 = cyan
' 100 = red
' 101 = magenta
' 110 = yellow
' 111 = white