Starfox 2 and M27C801-100F1 EPROMs?

The MARIO-1 chip is just the GSU-1 with the codename printed on it instead of the proper name. GSU-2 IS SuperFX 2, because GSU-1 was SuperFX. The GSU-2 was mostly a power/efficiency revision as opposed to feature which is why it was able to do the full 21MHz while the GSU-1 used a divider to go at 10.5.

edit: ooh, sorry if this was a bit of a bump, I forgot that I was looking at something a bit older. Might as well toss in some extra:

Why not hack out saving?