Pool of Radiance (the SSI AD&D game); possibly others in that line, too.
Simply because the C64 monster encounter illustrations (the image they showed before you'd go to the isometric battle map) were straight out of the 1st edition AD&D monster manual (or MM2 or Fiend Folio as the case may be). The Amiga used (sometimes animated) "new" art. Didn't care for it.
I liked Temple of Apshai on the C64 better. I can't pin down why, exactly.
