Abstract: A logic system is provided in a video system for accommodating the display of both video data characters and graphic characters, and the application of visual attributes to such characters whether occurring singularly or in fields.

Abstract: A logic system is provided in a video system for accommodating the display of both video data characters and graphic characters.

Abstract: A data processor performs a decimal multiply operation using apparatus including a register for storing multiplier decimal digits, a register for storing a multiplicand operand of decimal digits, a register for storing partial products and arithmetic logic units, and a read only memory for storing the units and tens product digits. The multiplier digit and a selected multiplicand digit are applied to the address terminals of the read only memory. On successive cycles, the units product digit and the tens product digit are added respectively to selected partial product digits and the sum replaces the selected partial product digits.

Abstract: A banking system is disclosed which comprises a central computer system in electrical communication with remote automated teller machines, wherein the architecture of the banking system is such that the likelihood of a security penetration is substantially decreased whether the automated teller machine operates in an on-line or in an off-line mode.

Abstract: A cathode ray tube display terminal includes a pluggable power supply. A recessed handle for removing the power supply from the CRT terminal is trapped by the AC line cord plug necessitating removal of the plug to permit access to the handle.

Abstract: A cathode ray tube display terminal includes a printed circuit logic board permanently mounted in a molded plastic enclosure assembly during "on the shelf" storage and shipment of the enclosure as a spare part and during normal operation of the CRT display terminal. The enclosure assembly includes a top portion and a lower portion which snap together. The printed circuit logic board is assembled between the upper and lower portions of the enclosure which are secured by a single screw. A snap-out section allows replacement of a read only memory on the logic board.

Abstract: A data processing system includes a number of input/output devices coupled to a communication multiplexer which polls the devices in a predetermined order. Apparatus in the communication controller rearranges the polling order to provide highest priority to an input/output device in a receive mode that is currently operative and to give lowest priority to an input/output device in a transmit mode that has just completed its operation.

Abstract: A commercial instruction processor executes decimal arithmetic instructions on string decimal and packed decimal operands. A read only memory is responsive to control signals generated from the operation code portion of the instruction, a type signal from a descriptor word of the instruction, and signals indicating the present decimal digit position being processed to generate signals indicating next decimal digit position to be processed.

Abstract: A logic control system in an intersystem link (ISL) unit accommodating the transfer of binary coded information between communication busses in a data processing system is disclosed, wherein information may be transferred between plural communication busses while further information flow continues on each communication bus at the bus rate, and additional information transfers between the communication busses continue to be handled by the ISL unit.

Abstract: A logic system is provided in a video system for accommodating the display of video data characters and the application of visual attributes to such characters whether occurring singularly or in fields.

Abstract: A commercial instruction processor executes a decimal divide instruction by counting the number of subtractions by the divisor resulting in a positive remainder to develop the quotient. Apparatus compares the most significant decimal digit of the divisor with the most significant decimal digit of the remainder after each subtraction pass to predict if the next subtraction pass would result in a negative remainder. If so, a quotient decimal digit is stored in a memory, the divisor is shifted one decimal digit position to the right, and a series of subtraction passes are made to develop the next quotient decimal digit.

Abstract: A communication multiplexer stores the receive and transmit channel numbers of input/output devices coupled to the multiplexer by communication lines in a first-in-first out (FIFO) memory. The input/output devices are polled by sending the channel numbers from the FIFO to the input/output devices. An input/output device requesting service responds to its channel number. The remaining channel numbers in the FIFO are recirculated to give the receive channel numbers priority over the transmit channel numbers. This gives high priority to a most recently used receive channel operative in a burst mode and equal priority to all transmit channels.

Abstract: A mosaic printing head for use in a computer printer includes a needle guiding assembly and an electromagnet assembly for activating the needles. The printer head utilizes a unique design to provide for simple and fast adjustment of the position of each printing needle while eliminating any effect on the adjustment because of vibrations occurring during the printing. This design allows the needle stroke to be adjusted so as to achieve very high speed printing operation.

Abstract: The present invention relates to document positioning and feeding apparatus for high speed printers, such as normally associated with data processing systems. The document feeding apparatus is particularly adapted to provide high quality, high speed printing of stock consisting of multiple pages or non-uniform thicknesses. It is useful for the printing of savings-books, checks and statement of account forms. The apparatus utilizes a unique coupling means to maintain equal and opposite rotation of the feeding elements and to substantially reduce relative rotary motion between the feeding elements during the feeding of stock into the printer. Novel support means allow the feeding elements to accommodate stock having a different thickness for one part of the stock compared to another part.

Abstract: Device for detecting the direction and change of rotational speed of a rotating element. In one embodiment, a pair of phototransistors which are energized by a light source according to an ordered sequence through a disk formed by opaque and transparent sectors coupled to the rotating element. The two phototransistors controls, when energized the switching on of two transistors which enable the discharge of two capacitors, charging with a predetermined time constant in the interval time between discharges. The discharge control action of one of the two phototransistors on a first capacitance is however conditioned by the charge level reached by the other capacitance and therefore both by the order in which phototransistors are energized and by the energization frequency. If the energization frequency is lower than a certain limit or the energization order is not the correct one, the first capacitor reaches a charge level higher than a reference value and supplies an indication signal accordingly.

Abstract: Information from a document is read by a reader sorter; the information is organized in fields including a transit field which is made up of 8 decimal digits and a check digit. The 8 decimal digits are each multiplied by a predetermined number which depends on the position of the decimal digit in the transit field as indicated by a position counter. Signals indicative of the decimal digit and the position in the transit field are applied to the address terminals of a Programmable Read Only Memory (PROM). Each address location stores the units position of the product of the multiplication of the decimal digit times the predetermined value. A firmware routine stored in a control memory performs the check digit calculation "on the fly" using the units position of the product from the PROM and certain status bits stored in a scratchpad memory.

Abstract: A microprogrammed data processing system includes a cache memory, a decimal unit and an execution unit. The decimal unit receives operands from cache memory, strips the non-decimal digit information from the operands, and assembles the 4-bit decimal digits from the operand into words containing a maximum of 8 decimal digits for transfer to the execution unit. The execution unit processes the words in accordance with a decimal numeric instruction. The throughput of the system is increased when processing short operands which contain 15 decimal digits or less by apparatus in the decimal unit which detects the short operand and determines the number of cache memory cycles between the cycle the first word of the short operand is received from cache memory and the cycle on which the first assembled word is transferred to the execution unit for processing.

Abstract: Digital data is recorded on the surface of a magnetic media such as a disk or diskette in the form of magnetic flux transitions identifying clock and data information in either a frequency modulation (FM) mode or a modified frequency modulation (MFM) mode. A read head senses the flux transitions which are in turn converted to digital signals. Apparatus converts the time between successive digital signals into PROM addresses. The PROM address locations store coded signals identifying the data as binary ONE or binary ZERO signals.

Abstract: A method and apparatus for assuring the accuracy of data received by any device in a computer system from any other device in the same computer system or from another computer system. The existing hardware of a computer system is utilized to generate a cyclic redundant check character each time a unit of data is transmitted. The cyclic redundant check character is concatenated to the right of such data transmitted. Each time that the particular data is received, the check character and the data with which it is associated, is again manipulated in the same manner as in generating the check character. If the data received is the same as the data transmitted, the result of such manipulation is zero.

Abstract: The performance of a scientific ADD instruction is improved by storing the mantissas of both operands in each of two random access memories, selecting the mantissa with the smaller exponent, shifting that mantissa and performing the ADD operation of adding the mantissas in one machine cycle.