some times you can find the old ti chips that were used in countless arcade games, the coleco vision (we had that too) and the 99/4(a)
I almost got a ti99, but in doing research I saw some WTF things, for example the coleco uses a slightly different chip which produces RGB output then its mushed together in a composite signal, which is dumb for a tv only game console
but on the other hand the 99/4a has the other model which was putting out ntsc from the chip, on a computer where you might want to (i dunno) read text?