 It proved unpopular as it did not include a mouse; the keyboard did not mimic all the features of the Apple Desktop Bus keyboard; and some cards designed for the Apple IIGS did not fit in the Apple IIe's slanted case.In the end most users found they were not saving much, once they had to purchase a 3.5-inch floppy drive, analog RGB monitor, and mouse.For a time the Western Design Center (the company that designed the 16-bit 65C816 processor used in the Apple IIGS) also sold a 16-bit 65C802 processor that was a drop-in, pin-compatible replacement for the 65(C)02 that made the full 16-bit 65C816 instruction set available to the IIe, but using the same 8-bit data bus as the 65(C)02; however, this upgrade was insufficient, by itself, to allow IIGS software to run, as IIGS software required the IIGS’s firmware and specialized hardware.