International Business Machines Corporation

John Wyn Jones

Joseph C Logue

Vincent P Thomas

Frank E Howley

A cathode-ray tube controller uses a content addressable associative storage array (10) to generate repetitively a sequence of video control signals for a CRT to which it is attached. A binary coded counter (4) incremented by the system clock (CL) of the CRT provides a sequence of binary count values representing the running count of the CRT clock. This running count is continuously available and applied as an input search argument to the associative array. A plurality of predetermined count values, derived with reference to the running count, are stored as binary coded words in selected rows of the associative array. The match signals generated on the sense lines of the array as the running count value becomes equal to the predetermined count values in the array provide the video control signals to control the various display functions of the CRT. One of the signals is used to re-set the running count value so that the sequence of signals is repeated at regular intervals. The timing of the video control signals is determined solely by the running count values entered into store. An input data register (15) is provided in order to load words into the array to define or to change the functions of display. A read register (17) is provided in which interrogated words are read for test and event timing purposes.

Cathode ray tube controller

This specification describes a set of arrays for performing logic function in various subsets of the original set. The array structure is characterized by a plurality of arrays joined together with a bidirectional bussing system. This bussing system comprises addressing lines of the arrays joined together by switching circuitry used to regroup the set into subsets as necessary to perform the logic functions.

Reconfigurable logic array

This specification describes an associative memory cell capable of performing logic functions. The cell comprises two transistors with their collectors connected to an output line and their emitters connected to an input line carrying either the true or complement of one variable. The bases of the two transistors can each be selectively connected to either the true and complement of a second variable or fixed at one of two reference or logic levels to permit the performing of sixteen different logic functions of the two input variables by the cell.

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Winchester, United Kingdom

John Wyn Jones