mirror of
https://github.com/hsoft/collapseos.git
synced 2024-12-26 05:28:05 +11:00
2f1e635b9d
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.
17 lines
574 B
Plaintext
17 lines
574 B
Plaintext
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.)
|