collapseos/blk/551
Virgil Dupras 44b065ff99 ti84: unify drivers
No more low/high
2020-05-12 12:41:47 -04:00

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TI-84+ LCD driver
Implement (emit) on TI-84+ (for now)'s LCD screen.
Load range: 555-560
The screen is 96x64 pixels. The 64 rows are addressed directly
with CMD_ROW but columns are addressed in chunks of 6 or 8 bits
(there are two modes).
In 6-bit mode, there are 16 visible columns. In 8-bit mode,
there are 12.
Note that "X-increment" and "Y-increment" work in the opposite
way than what most people expect. Y moves left and right, X
moves up and down.
(cont.)