the IIgs didn't use a 65802, but a 65c816. when a iigs ran 6502 software is wasn't emulation, but running on a real 6502. _inside_ the 65816. the '816 is register compatible with the '02. The extra sixteen bit functions are tacked on to the end of the 6502 register set in the '816. so it runs all of the old software. full speed or double speed.