Released 1990: geoRAM is a 512 KB memory expansion for the C64 and C128 from the company Berkeley Softworks. During the chip shortages of the 1980s, Commodore could not produce enough of its RAM Expansion Units (they eventually cancelled them).
Released 1982: The Commodore 64 CP/M cartridge was released shortly after the introduction of the C64 itself. The cartridge contained a Z80 CPU to run CP/M 2.2 operating system. The CP/M cartridge was cancelled around 1983 I think, and reportedly will
Released 1992: The Amiga A570 is a single-speed external CD-ROM drive for the Amiga 500 computer launched by Commodore in 1992. It was designed to be compatible with Commodore CDTV software as well as being able to read ordinary ISO