Can that be true? (I'm channelling 1985 here, so I could be well off, but...)
IIRC, some of the janky stuff I did on the Apple //e 6502 did run on the Apple IIc 65C02. I'm pretty sure they didn't fall of into NOP-land. (Again, I could be mis-representing this, but I was taking some shortcuts at one point to accelerate some graphics that ended up in a Broderbund game, so I don't think I am? (Time wastes all memories - I could well be wrong))