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Colour memory
AddressLenNameBit 7 Bit 6 Bit 5 Bit 4 Bit 3 Bit 2 Bit 1 Bit 0Description
D8001000COLMEMNot ConnectedColourColour Memory
D8E824Not ConnectedUnusedUnused

Memory format

For each character in every row (40 chars per row; 0-39) and column (25 columns; 0-24) one of 16 colors can be assigned. The color values 0-15 are only used in the lower nibbles. The upper nibbles are undefined and are purely random values.

The colour memory is provided by an MM2114N-3 4Kb (1024x4) static RAM chip.

As this chip only provides 4 bits, the upper nibble is random as it's not connected to anything. It is separate from the onboard 64K RAM