< 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 beige was a later model and is the same circuit as far as I know though the roms are a bit different. The beige will not play some non TI games that the black/metal trim one would. There is an active TI99 list. I not have the Listserv address beyond the ti99(a)theriver.com (there is a different address to subscribe). Allison