The
IBM System/360 (
S/360) was a
mainframe computer system family announced by
IBM on April 7, 1964, and delivered between 1965 and 1978. It was the first family of computers designed to cover the complete range of applications, from small to large, both commercial and scientific. The design made a clear distinction between
architecture and implementation, allowing IBM to release a suite of compatible designs at different prices. All but the incompatible model 44 and the most expensive systems used
microcode to implement the instruction set, which featured 8-bit byte addressing and binary, decimal and (
hexadecimal)
floating-point calculations.