14 Jul
2000
14 Jul
'00
7:06 a.m.
On Fri, 14 Jul 2000, Tony Duell wrote:
Apart from the 9918 and some RAM, what else was there in the 99/4A
graphics system? The 9918 did all the sprite stuff internally IIRC.
It had a sound chip (TMS9919, I think) as well as a proprietary form
of memory called G-ROM (for Graphics Rom).
N.B. stock TI 99/4A's had very little RAM directly accessible from the
CPU (about 256 bytes!) All programs were stored in either G-ROM or
the 16 K of RAM accessed via the 9918 VDP.
The TMS9918A was the TI/994A graphics controller chip,
IIRC.
The sprite board was almost a whole TI home computer on a board,
at least graphics wise. I never got to play around with one, but I