The MOS KIM1 was the worlds first fully assembled computer. It was a fairly popular KIT computer that MOS technologies released in 1975 for just US$245 as a ‘Computer Trainer’. Commodore bought MOS in 1976 for US$800,000 and renamed it to Commodore Semiconductor Group (CSG). CSG continued to make the KIM-1 until about 1980.
The information and schematic below are Richard Cini’s excellent site. They were reproduced October 14, 2002 with permission granted in July of 2002. Thanx again Richard!