Abstract: An aperture control system comprising a computer aided design workstation for generating CAD aperture data, a data converter for reading the aperture data and generating, in response to the aperture data, converted aperture data, and a PCB optical, laser or other suitable plotter for generating a mask from the converted aperture data.

Abstract: Overflow detector connects in parallel with a shifter to receive the bits of an operand to be shifted for detecting an overflow condition by defining the location of the operand sign bit and detecting a predetermined change in operand bit position value. The detector generates a binary value indicating the bit position where the change occurred. This value is then compared with a value designating the number of shifts to be performed on the operand by the shifter. When the number of shifts is greater or equal to the binary value denoting the bit position, the detector signals the presence of an overflow condition.

Abstract: A data processing system includes the functionality of a commercial instruction processor, a scientific instruction processor and a basic instruction processor integrated into a single semiconductor logic element.

Abstract: A digital computing system includes an addressable read only memory for storing microprogram control words. A plurality of the microprogram control words each include a predetermined bit used for branching. When the predetermined bit within a control word is not set, the next microprogram control word is read from the next microprogram memory address. When the predetermined bit is set, the next microprogram word is read from the microprogram memory address having a value which corresponds to the next address plus a weighted value of the predetermined bit.

Abstract: An apparatus for increasing the capacity and speed of access of a large microprogram read only memory. The apparatus incorporates the use of a four bit control field in a microinstruction word which is set into a hardware register to extend the address beyond the normal range of the addressing capability of the microinstruction word. The four bits stored in the hardward register allow one of a maximum of sixteen read only memory banks to be selected. The word in the selected bank is selected by the normal range. This technique also allows the selection of another of the read only memory banks in one machine cycle.

Abstract: A method and an apparatus for improving the speed of executing instructions and reducing the microprogram memory requirements in a conventional digital computer system. The method or apparatus incorporates the use of a predetermined bit position in the microinstruction word which is set to a binary one when the microword is the last microword of an executing microprogram. The apparatus is responsive to the electronic representation of the binary one signal to cause the microinstruction execution sequence to branch to a predetermined location in the microprogram memory for execution of the following microinstruction; thus, eliminating at least one step in returning to a common address for starting the execution of another microprogram.

Abstract: A method and an apparatus for improving the speed of executing instructions and reducing the microprogram memory requirements in a conventional digital computer system by eliminating a ROM address register for addressing microwords. The method or apparatus incorporates the use of a predetermined bit position in the microinstruction word which is set to a binary one when the microword is the last microword of an executing microprogram. The apparatus is responsive to the electronic representation of the binary one signal to cause the microinstruction execution sequence to branch to a predetermined location in the microprogram memory for execution of the following microinstruction; thus eliminating one ROM address register and at least one step in returning to a common address for starting the execution of another microprogram.