The last member of the Apple II line, the Apple IIGS was also the most powerful. Announced in September 1986, the IIGS was built around a 16-bit Western Design Center 65C816 processor running at 2.8 MHz (switchable to 1 MHz for compatibility with older Apple II software). It included expanded graphics and sound functions, as referenced by the "GS" in its name. It was initially offered with 256 KB of RAM, expandable to 8 MB. The IIGS also offered 128 KB of ROM, expandable to 1 MB. The IIGS shipped with a Mac-like interface and a IIGS-specific OS - the