A microprocessor based apparatus for use as a bus controller and as a remote terminal in a time-division multiplex serial data bus system. The apparatus comprises a single chip which, in a preferred embodiment, is in the form of radiation hardened LSI/CMOS/SOS. It operates on a one bit per instruction basis and includes program control of output signals and word length. The described embodiment is program adapted to satisfy the performance requirements of the applicable military standard, but is...

A program protection module for a programmable controller checks the critical, or protected, portion of the control program each time the controller is switched to the run mode. This is accomplished by reading each control program instruction out of the controller memory and comparing it with a corresponding control instruction stored in a nonaccessible read-only memory. If all the compared control instructions are identical, the module sets a status bit in the programmable controller which enab...

A data processing system has a main memory, a buffer memory, an instruction control unit, and an arithmetic unit. The data processing system also includes a register for storing an address for previous transfer and an adder for successively increasing the contents of the register to thereby transfer data in continuous regions of the main memory to the buffer memory when an instruction which causes the arithmetic unit to utilize the data is detected.

A data processing control apparatus comprises a main memory for storing a plurality of record data serially arranged with a record positioning code between the record data, each record data including a plurality of word data serially arranged with a word positioning code between the word data, the word data each including at least one character data; and a processing memory means having a row/column matrix which is address designated by the outputs of row and column counters for permitting each ...

An electronic dictionary comprising an input device, a display, a dictionary memory, a searching device, and an indicator device. The memory consists of plural divisions of equal storage capacity and stores multiple sets of word data representative of different words in an alphabetical order. Each set of word data is stored in one of the plural divisions such that each of the divisions has at its end a waste portion storing no part of any of the multiple sets of word data, if the number of chara...

Bus driving and decoding circuit for validating the decoding of signals put on the bus by said drivers, comprising a plurality of driver elements and a decoder connected to the bus, the drivers being grouped in at least two sets, each implemented in one integrated component having a control input for enabling the opening of the related driver set, the control input receiving an enabling signal which is further input to one driver in each integrated component, so as to obtain at the output of the...

The invention is a method and apparatus primarily for generating pixel representations for the video display of three-dimensional objects projected onto a two-dimensional pixel plane. The scanlines of the pixel plane are associated into N interlaced sets, each set having as members only scanlines having an equivalent vertical pixel location Modulo N. The image memory unit block utilizes both serial and parallel processing. For each color (red, green and blue) and for calculating depths, each ima...

In a data processing system, a mechanism provides independent assignment of page locations for a program's instructions and its data and better enables control to be transferred between programs, or portions thereof, that reside at different addresses in different pages of a multiple page instruction store. The initial linkage is established through the use of a Branch And Link instruction. Subsequent linkages are established through the use of Return and Link instructions, each of which transfe...

A hand-held data-gathering unit is formed by removably connected control and power modules: The control module contains a keyboard, a display device, a data input probe, and a microprocessor. The power module contains a rechargeable battery with a converter and associated power logic, and a memory system with associated memory control logic. The hand-held unit has a normal low-power standby mode which is maintained during the absence of input data from either the keyboard or the data probe, and ...

Bubble compression in a pipelined central processing unit (CPU) of a computer system is provided. A bubble represents a stage in the pipeline that cannot perform any useful work due to the lack of data from an earlier pipeline stage. When a particular pipeline stage has stalled, the CPU instructions that have already passed through the stage continue to move ahead and leave behind vacant stages or bubbles. If a bubble is introduced into a pipeline and the pipeline subsequently stalls, the disclo...