=> R0 = palette entry
R3 = 0 for foreground or 128 for background
R4 = GCOL action
<= R0 = GCOL
R2 = log2 of bits-per-pixel for current mode
R3 = initial value AND &80
R4 preserved
This call, given a palette entry, works out the furthest GCOL in the current mode and palette, and sets it.
The top three bits of R3 and R4 should be zero to allow for future expansion.
See PRM 3, page 357.
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