Microcode control apparatus utilizing programmable logic array circuits

Abstract From the Canadian patent

Abstract of the Disclosure, To provide for efficient use of computer microcodes, a firmware structure containing a mainline programmable logic array circuit and at least one subroutine programmable logic array circuit may be used. As the states of the mainline programmable logic array circuit is sequenced, the data bits representing the encode number field in its OR array is compared with the data bits representing the encode number field of the AND array of the subroutine programmable logic array circuit. If a match is made, the mainline programmable logic array circuit suspends its operation and sequencing of the subroutine programmable logic array circuit begins, in order to perform the …