Abstract:
A data processing system which includes a commercial instruction processor for executing decimal alphanumeric instructions uses read only memories in the alignment of the operands. The characteristics of the operands, string or packed decimal, as well as the length and position of the most significant decimal digit in a main memory word, are specified by data descriptors. The read only memories are responsive to the data descriptor information as well as the instruction being executed to generate signals which specify whether the direction words are read from main memory, high order word first or low order word first, the number of double words in the operand and the location of the least or most significant decimal digit within the word as stored in registers of the commercial instruction processor.
Abstract:
In a computer system having a plurality of processors and processes, a semaphore architecture for communication with and between the processes in order to effects coordination and cooperation between processes. The invention is implemented in firmware and software, and divides the work of an entire semaphore operation such that the simple part of the P and V operations (which deliver and pick-up signals to and from the processes, respectively) is done by the firmware; whereas the difficult work of the P or V operation is done by software. Thus the improved architecture increases the speed of the system by the use of firmware and increases the flexibility of the computer system by utilizing software to change functionality.
Abstract:
The invention pertains to a method and apparatus to provide for the display of characters and graphics in color. The invention includes three bit map memories which store graphics information for different colors, one character generator driven from a text memory for display of text, and an attribute memory for storing display characteristics such as inverse video and blinking. The contents of the bit map and attribute memories and the output of the character generator are used to address a pre-programmed ROM. The output from the ROM is a string of three bit words with each bit stream representing a primary color on a color CRT and being connected to the associated color input to the CRT. Composite graphics and text are displayed on the CRT.
Abstract:
A pair of conductive ground clips each having a plurality of flexible fingers, are slid into an interference engagement with the ends of a flange of a D-shell connector. The ground clip equipped connector is held in a plastic connector housing which is latched to a conductive plate by flexible latching arms that are a part of the connector housing. As the connector housing is latched to the plate with the latching arms, flexible fingers on the clips touch the plate and flex making and maintaining a good electrical connection therewith. The ground clips maintain a proper electrical ground connection between the housing contained connector and the plate avoiding undesirable electrostatic discharge, electromagnetic interference, and radio-frequency interference.
Abstract:
An electronic system is packaged to provide a single etched backplane. Bus bars are physically fastened to bushings which are soldered to the backplane power etch lines to provide power to the system.Printed circuit boards are plugged into connectors mounted on the backplane for receiving power and transferring logic signals between printed circuit boards. A number of power supplies are plugged into connectors mounted on the bus bars for transmitting power, and plugged into connectors for transferring logic signals.
Abstract:
A color display graphics system includes three bit map memories for storing bits representing red, green and blue colors respectively. Combinations of bits from the same address locations of each bit map memory display a pixel which could be any one of eight colors: black, blue, green, cyan, red, magenta, yellow or white. A read only memory (ROM) stores patterns made up of sixteen bits in a four-by-four matrix for each of the red, green and blue colors. The 16-bit matrices are stored in their respective bit map memories for subsequent color display. Combinations of matrices may be used to show shades of the above eight colors and the mixing of any of those shades.
Abstract:
Apparatus that provides interrupt operation in a central processor based system wherein internal subsystems are operated via addresses generated by a next address generator in the processor and sent to control stores associated with each subsystem to thereby read out firmware instructions which are used by a controller in each subsystem to control the operations of same. When a special condition is detected in ones of the subsystems a trap signal is sent to the next address generator which responds by generating a microinstruction address to the subsystem that generated the trap signal. The subsystem responds to the microinstruction to read out a register, the contents of which indicate the status of processing in the subsystem including the special condition. The register contents are forwarded to the processor which tests same to determine the nature of the special condition and calls a microprogram the microinstructions of which are applied to the control store of the subsystem that generated the trap signal. The subsystem responds to the microinstructions to clear the special condition. Certain subsystems may alternately send a special condition indicating signal directly to the next address generator, rather than a trap signal, and responsive thereto the next address generator calls the required microprogram to be applied to the control store of the subsystem that generated the indicating signal.
Abstract:
A minicomputer system is disclosed having a bus with a plurality of processors and/or subprocessors, input/output (I/O) units and including logic for enabling an alternate route for issuing instructions from one processor to another. The logic detects information that is not to be transferred to the I/O devices and accordingly reroutes it back to the central processor and/or subprocessors.
Abstract:
A novel method and apparatus for latching and locking D-type electrical connectors. In one embodiment a novel "bud-stud" is utilized to replace prior art isoblocks or prior art hexagonal nuts. The bud-stud is capable of mating with either a prior art screw-type or spring-loaded latching arm to latch and lock the electrical connectors to each other and to a bulkhead.