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CharPad 2.8 User Manual - Subchrist Software, 2021.

Display Modes - Multi-colour Character Mode.

Multi-colour character mode allows up to 256 different character images to be displayed on a 40x25 byte screen matrix.

This mode is capable of simultaneously displaying both hi-res (8x8 pixel, 1bpp) and multi-colour (4x8 pixel, 2bpp) character images.

The colour matrix at $d800 (55296) is used to set the foreground colour and the display mode of each character image...

The highest bit (bit 3) of each colour nybble is used to set the display mode for each character cell (1 = multi-colour).

The lowest 3 bits of each colour nybble are used to set the foreground colour (0-7) for each character cell.

All character images share a common background colour which can be set using the VIC register at $d021 (53281).