Texas Instruments TI-99/4A

From: Allison J Parent <allisonp_at_world.std.com>
Date: Sun Sep 27 18:06:08 1998

>Recently I added a Texas Instruments TI-99/4A to my collection. Since
< >then I also bought one in a off white or beige case (I'm not sure what
< >you would call the color). Was the non-metal case version of the
< >TI-99/4A a later model? I also need to know if anyone has a schematic
< >for both of these models?

The sequance was the TI99/4 (chicklet keys), TI99/4a enhanced display and
real keyboard and the beige TI99/4a revised roms.
 
< The silver and black model is the original one. The beige, all plastic
< case is the later model. IIRC the later model has circuitry which preve
< it from running third party cartridges.

It was not a hardware change that I know of and I have several of the
black and later beige units. It is a firmware difference.

Allison
Received on Sun Sep 27 1998 - 18:06:08 BST