Added the ability to set an individual pixel on the screen by coordinate. Doesn't look like much, but from here I can bring in font processing.
At 656 bytes- so getting pretty close the the line already. Going to have to find something to trim...
Had to pull out some fun, space-saving assembly math tricks:
y % 8 == y AND 0x07
y / 8 ... is the same as... right shift y 3 times
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