Old computer is a term used to describe computers that are no longer in use. The term can refer to computers from the 1980s and earlier. Tandy is a brand of computer that was popular in the 1980s, and was known for its affordability and ease of use. AMIGA was a brand of computer that was popular in the 1980s and 1990s, and was known for its multimedia capabilities. An ABACUS is an ancient calculating device that was used before the invention of computers.