USAC 820DX

This was an ultra-small computer developed and manufactured by the USAC Electronic Industrial Co. The USAC 820 was announced by Uchida Yoko in September 1975 as the successor of USAC 720 Series, and the FACOM Bm was announced by Fujitsu in December 1975 as a lower computer of the FACOM V0Series (FACOM V0/V0S). Both computers were developed for comparatively small-scale enterprises whose main work was billing. In May 1977, 3 types were added, with shape designed to suit the type of printer used primarily for billing, and these formed the FACOM Bm Series and USAC 820 Series.