Microinstruction sequencer capable of instructing arithmetic, logical and data move operations in a conditional manner

Abstract From the Canadian patent

A microinstruction sequencer capable of directing an arithmetic-logic unit means to conduct conditional operations is disclosed and generally comprises a ROM and a selecting means. The ROM has a memory of m bits wide and n words long wherein for, an m bit wide word in the ROM which defines a conditional operation, a first plurality of bits of the m bits are allocated to a first set of bits for instructing the arithmetic-logic unit as to the function it is to perform, a second plurality of bits of the m bits are allocated to a second set of bits for instructing the arithmetic-logic unit as to the function it is to perform, and a third plurality of bits of the m bits are allocated to a set of …