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CharPad 2.8 User Manual - Subchrist Software, 2021.

Display Modes - High Resolution Character Mode.

High Resolution character mode allows up to 256 different character images to be displayed on a 40x25 byte screen matrix.

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).

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