#### Back to index | # Info for ti99_4ev

#### Texas Instruments TI-99/4a Home Computer with SNUG EVPC video card

See the TI99/4a driver for non-EVPC information.

Known Issues:
EVPC emulation is not complete. The palette chip is not emulated.
Also, TI BASIC will not run under this driver, though it might be normal
(I know there are some bugs in the TI's system ROMs which prevent them
from running with a v9938).

History and Trivia:
A common hack on the ti99/4a is replacing the old tms9918/9928/9929a with
a higher-end, upward-compatible v9938. This enhanced vdp supports true 16-
and 256-color graphic modes, high-res 512*192 graphic and 80-column text
modes, accelerated 2D graphics, etc. The only drawback is that some programs
(including TI's system ROMs) will not run with the v9938.
The EVPC card does just that: it includes a v9938 with 128kb of VRAM, 64kb of
extended RAM, an additional palette chip to program the palette in 256-color
mode, and a DSR ROM with various useful subroutines.

created on Mon Dec 09 08:16:57 2002