Also a series of expansion boards for the Apple //e and Apple IIgs from Applied Engineering. The Apple //e version basically replaced the onboard 6502 with a 65c02 that would run at 4 Mhz, up from 1. The Apple IIgs version shipped running at 8 Mhz, up from 2.6. Through overclocking and clock crystal replacing, certain people who wrote into A+ Magazine were able to get their GSs running at a warm 15 Mhz. Simply astounding.