These are the games that don't work (I still haven't checked them on the A1000 though, so there's a chance that the disks have gone bad, though I tested them all about a couple of years ago):
Nitro (starts loading then stops after 10-15 sec. before showing the first screen)
Tetris Plus - after the intro, it hangs
R-Type - immediately after boot it hangs with a garbled b/w screen
Flight Simulator - shows a shell-like screen, with the 1> prompt
Another World - hangs early in the boot
Pinball Dreams - Loads OK but has sound glitches, and when the actual game is loaded, the keyboard doesn't respond.
Then, there are some games that work but with some glitches (i.e. Test Drive works but has glitches like digital noise in the music). Other games too show garbled/out-of-sync music.
This is a partial list as I'm still testing more games (it takes time, as I actually play with every game that works!

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Are these characteristic symptoms of incompatibility? I'm trying to rule out hardware problems!

Cristian