Minicomputer system with an arithmetic control unit integrated on a one-chip semiconductor device

摘要

A minicomputer system comprising an arithmetic control unit integrated on a one-chip semiconductor device using n-channel silicon gate E/D MOS technology and a control storage separate from and connected to the arithmetic control unit for storing microinstructions. The arithmetic control unit includes two kinds of read only memories, each having a small memory capacity. The first read only memory stores start addresses of specific microinstructions for phase control, an illegal instruction trap and an initialization trap. The second read only memory stores auxiliary microinstructions to handle operations involving an accumulator, general registers and an instruction register in the arithmetic control unit.