Difference between revisions of "Tilemap Transparency Index Register"

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Latest revision as of 10:00, 14 April 2019

Number $4C
Readable Yes
Writable Yes
Short Description Index into Tilemap palette (of "transparent" colour).
bits 7-4 = Reserved, must be 0
bits 3-0 = Set the index value (0xF after reset)

The pixel index (bottom 4 bits) from tile graphics is compared before the palette offset is applied to upper 4 bits, so there is always one index of the 0-15 working as "transparent" colour.