<= R0 = pointer to 256 entry table of 5:5:5 BGR values
R1 = pointer to 32768 entry table of colour numbers
This SWI calculates a pair of lookup tables for the current destination mode, remaining available until the next mode change.
The 256 entry table maps from a colour number to corresponding 5 bit component colours held as 256 words of 4 bytes each. The 32768 entry table performs the reverse mapping to get back to an 8 bit colour number.
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