TI 990 architecture / was Re: TI-99/4A Floppies - test-drb@ccmp.vtda.org

3 Oct 2007

On Oct 3, 2007, at 12:48PM, Dave McGuire wrote:
...
  On Oct 2, 2007, at 3:47 PM, Martin Scott Goldberg
wrote:
   There are
really three 99/4 home computers, original with chiclet
 keys, the
 second and most common with a really nice keyboard and the whie
 version that
 is really the same thing with a few board level cost reductions. 
 Actually, there's one TI-99/4 and two TI-99/4a models. 
   What are the differences between them, does anyone know offhand?

         -Dave 
Apparently, I'm one of the resident TI-99 experts!

The differences are almost exactly as Martin said; the 99/4 is the
first computer he described, and the 4As are the second two.  The 4's
only benefit was the built-in 'Equation Calculator' mode; sure mark of
TI's educational division.  The 4As had, other than a better keyboard,
the ability to use 'lowercase' (just small caps), and not much else.

More info can be found at Thierry Nouspikel's pages, which are
currently at <http://www.nouspikel.com/ti99/titech.htm>, and at the
Mainbyte pages, at <http://www.mainbyte.com/ti99/>.

And now I'm out the door!

~Matt