A89: TI-89 LCD Driver
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A89: TI-89 LCD Driver
I have a few questions about the LCD driver for the
89. Maybe some of you know the answers or maybe I
will just have to try some tests.
I assume that the driver doesn't use built-in graphics
RAM, because if it did then grayscale wouldn't work.
Therefore, it must use the RAM that it is assigned to
draw its image from, and not mask over it. Does it
use bus mastering to read the RAM, or what? How much
time does an entire read take?
Can the address it draws its image from be in the
flash ROM area? Do its reads to the RAM or ROM go
through the U8 chip that controlls flash protection?
Is this why the TI-OS disables LCD update when
unprotecting the ROM? Maybe the LCD reads can be used
to unprotect the ROM on any current or future AMS.
Just some food for thought. :)
- Jeff Flanigan
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