This is more curiosity than desire. The 8563 used for the Commodore 128's 80 column mode is able to do 16 more-or-less ANSI colors in 16k with 8x8 characters (640x200.) My guess is the VDP's table layout might preclude similar ability? Does the 9938/58 support color in 80 columns?
I don't know about the 9938 (I don't think it does), but the F18A allows full color in T40 and T80 modes, as well as sprites and the bitmap layer. You have to enable one of the Enhanced Color Modes though.
Color is supported.
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