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collapseos/blk/551
Virgil Dupras 2f1e635b9d ti84: tidy up driver code
Pushed all words directly interfacing with ports and memory offsets to
low level layers. This saves us the need for keeping those variables in
runtime memory.
2020-05-09 08:50:55 -04:00

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TI-84+ LCD driver
Implement (emit) on TI-84+ (for now)'s LCD screen. The low
level part are blocks 555-557 and high level ones are 558-560.
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.)