Abstract: Disclosed are methods and apparatus for multi-way program branching in a digital computer based on the contents of a data register. This is accomplished by loading any data field of interest into a data register and using the output lines as address lines to a plurality of read-only memory devices. Each device contains a set of random memory addresses. Logic circuits under program control select and enable one device, thereby producing one address. Finally, circuits under program control force a program branch to the location address produced. Thus, by programming the read-only memory devices and the computer appropriately, a plurality of sets of data fields are associated with and result in branches to a plurality of sets of locations, thereby giving the programmer the general capability of branching to any one of the plurality of locations within one instruction execution cycle based on the interrogation of any one data word.

Abstract: This digital circuit generates a window during which the data bit transitions of phase encoded data may be read from magnetic tape. This circuit contemplates a system for reading nine track tape and comprises one phase lock loop and window generator for each track, and the logic and control circuitry necessary to deskew and output the data in the form of nine bit bytes. Each phase lock loop is individually free to correct itself to conform to the variations of its own track, and the control circuit can compensate for a total skew of up to four bit times.

Abstract: Method and apparatus for dynamically braking a multiphase motor wherein, in a first embodiment, the stator windings of the motor are connected in a six winding delta configuration and direct braking current is applied between two center taps of the configuration. A damping diode is connected across two of the delta center taps to minimize voltage transients in the windings when the direct current is removed.In a second embodiment, the stator windings are connected in a twisted Y--Y configuration, the connections to the neutral points of the two Y's of one phase winding set being interchanged and direct braking current being introduced between the two neutral points. A damping diode is connected between the center points of each Y to minimize voltage transients in the windings when the direct current is removed.

Abstract: In a facsimile transmission device, means for reducing the bandwidth which includes a clock rate halving flip-flop and an odd-even line switching flip-flop which are logically combined to transmit every second data bit in each line in a vertical stagger between lines. At the receiving end the missing bits are filled in by an interpolation device according to the data in the vertically adjacent bits or the horizontally adjacent bits.

Abstract: Data processing and computer systems require continuous monitoring of the primary alternating current power. A power failure must be detected very quickly (within a fraction of a cycle), so that the contents of a volatile memory can be quickly converted into a nonvolatile form. This must occur before power system storage is expended and control is lost. RMS power direction is developed by the product of voltage and current with an integrated circuit multiplier device. When power fails, the circuit indicates a power flow reversal or power equals zero from the detected system current times voltage factor. A retriggerable one-shot in conjunction with a NAND gate is utilized to detect the instantaneous voltage drop to zero and current reversal in order to energize other circuits to protect such volatile data in the event of a power failure.

Abstract: A printing system adapted for creating hard copy output from computer generated digital pulses. This system feeds blank or preprinted paper from a paper supply station through a xerographic processor wherein readable computer generated images are created thereon. The information bearing paper is then transported to a paper receiving station which comprises one or more paper receiving bins. Alternatively, an auxiliary feed path for the output paper is created to direct pages, under certain circumstances, to a sample print tray. Paper deflecting fingers are provided to divert pages to the sample print tray under the control of the operator in response to one of four conditions. These conditions include: (a) The feeding of a sample page through the processor when power is first applied to the machine after the machine has been in a powerless state, or (b) After a jam in the system has been cleared and it is desired to abort pages which have not been removed from the paper path.