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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.)
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