Commodore's response to the IIGS was to make the Commodore 65 an upgraded Commodore 64 with Amiga style graphics and sound. It never came out. There is a clone at http://mega65.org/ that tries to complete the Commodore 65 with a 50Mhz CPU. Something about the 6502 not being able to be clocked more than 25Mhz prevented it so they made the 4502 that can go up to 50Mhz.