The IBM System/360 (S/360) was a mainframe computer system family. 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.
"We have not grown so big, and we are not so successful, that we no longer need the help of others. Nor are we so securely on top that we can all lean back in our chairs and lull ourselves into thinking IBM will go on forever, whatever we, as individuals do or don't do. "