[gp2000]

Good analysis. It actually uses the 64 x 16 text mode which has semigraphics yielding a 128 x 48 display. I only use 112 x 48 due to floppy disk bandwidth limits. I'm thinking of trying the 40 x 24 text mode. The 80 x 96 resolution would be a little nicer despite having two difference sizes of pixels. Or go the full 160 x 96 but that would require data compression of the video.

The hires adapter card has pretty serious write bandwidth limitations though there are possibilities if you're willing to put up with severe screen hashing.

It is pretty surprising how good 31250 Hz 1 bit audio can sound. As long as you set your expectations reasonably. "Was recognizable and didn't make my ears bleed too much" is about right.