a chess program by Robert Arnstein for S-100 bus microcomputers, consisted of the pins of the Intel 8080 run out onto the backplane. It was commercially marketed in the 70s by Processor Technology Corporation. The 8080 Chess manual is still available online. 8080 Chess was the first microcomputer to participate in an ACM North American Computer Chess Championship, the ACM 1977 . It further played the Second West Coast Computer Faire Microcomputer Chess Tournament in March 1978 .
8080 Chess Display 
- Classic Computer Chess - ... The programs of yesteryear by Carey, hosted by the Internet Archive