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CharPad 2.8 User Manual - Subchrist Software, 2021.

Display Modes - Extended Colour Character Mode (ECM).

Extended Colour character mode allows up to 64 different character images to be displayed on a 40x25 byte screen matrix using one of 4 different background colours per screen cell.

Each character image is 8x8 pixels in size and uses a bit depth of 1 bit-per-pixel (two colours).

The foreground colour (0-15) of each displayed character image can be set using the 40x25 byte colour matrix at $d800 (55296).

The lower 6 bits of each screen matrix cell are used to select the character image (0-63) and the upper two bits are used to select a background colour...

• 00 (0) = Background colour is taken from VIC register $d021 (0-15).
• 01 (1) = Background colour is taken from VIC register $d022 (0-15).
• 10 (2) = Background colour is taken from VIC register $d023 (0-15).
• 11 (3) = Background colour is taken from VIC register $d024 (0-15).