512kb RAM expansion for Amiga 500. Can be expanded to 1Mb, 1.5Mb, 1.8Mb, 2.0Mb totalling up to 2.5Mb. 1Mb - 1.8Mb requires Gary adapter. It's possible to expand the Amiga 500 to 1Mb chipmem with the CPU adapter that comes with the expansion (picture missing)