- CE OS partial 8bpp support
- 16 Nov 2020 12:21:25 am
- Last edited by Zeroko on 16 Nov 2020 12:49:42 am; edited 3 times in total
The TI-84 Plus CE OS has partial support for 8bpp mode (at least 5.3.0 through 5.6.0, but not 5.1.5). It can be enabled by running this program:
Code:
& disabled using this program:
Code:
Putting the LCD in 8bpp mode & setting up the palette is left as an exercise for the reader. With the LCD in 16bpp mode (the normal operating mode in the OS), the status bar & other working elements look half as tall & doubled horizontally.
It only works in some places in the OS, & often only part of a screen is correct. I tried to include all the interesting ones below. The small font sometimes works, while the large font never does. (One thing I forgot to include is that the 2nd/alpha indicator in the status bar works, as does the run indicator.) Usually when it does work, the byte stored in VRAM is the first byte of the 16-bit color, but sometimes it is some other, apparently-unrelated value.
EDIT: I added the mode screen looking almost correct, which can be obtained by loading & clearing a menu that returns to the mode screen.
EDIT: I also verified that it works in 5.6.0.
EDIT: A color.
Screenshots (in CEmu with LCD forced to 8bpp mode & my attempt at making the palette work):
Power-on help
Mode screen with language selector highlighted
Almost-correct mode screen
Format border color
Format background color
Y= editor
Graph with background color set
Colors (some are wrong due to collisions)
More colors
No picture
Stat plot menu
Catalog help
Cabri Jr. app
Test mode options
Other test mode options
Code:
Asm84CEPrgmFDCB46D6C9& disabled using this program:
Code:
Asm84CEPrgmFDCB4696C9Putting the LCD in 8bpp mode & setting up the palette is left as an exercise for the reader. With the LCD in 16bpp mode (the normal operating mode in the OS), the status bar & other working elements look half as tall & doubled horizontally.
It only works in some places in the OS, & often only part of a screen is correct. I tried to include all the interesting ones below. The small font sometimes works, while the large font never does. (One thing I forgot to include is that the 2nd/alpha indicator in the status bar works, as does the run indicator.) Usually when it does work, the byte stored in VRAM is the first byte of the 16-bit color, but sometimes it is some other, apparently-unrelated value.
EDIT: I added the mode screen looking almost correct, which can be obtained by loading & clearing a menu that returns to the mode screen.
EDIT: I also verified that it works in 5.6.0.
EDIT: A color.
Screenshots (in CEmu with LCD forced to 8bpp mode & my attempt at making the palette work):
Power-on help
Mode screen with language selector highlighted
Almost-correct mode screen
Format border color
Format background color
Y= editor
Graph with background color set
Colors (some are wrong due to collisions)
More colors
No picture
Stat plot menu
Catalog help
Cabri Jr. app
Test mode options
Other test mode options
