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Deriving Display Functions by Means of Coded Space Informations

IP.com Disclosure Number: IPCOM000073699D
Original Publication Date: 1971-Jan-01
Included in the Prior Art Database: 2005-Feb-22
Document File: 2 page(s) / 39K

Publishing Venue

IBM

Related People

Horgan, TB: AUTHOR [+4]

Abstract

This display system comprises a regenerative display 7 and a memory 1 where the latter provides the information which is displayed. Memory 1 has a plurality of memory addresses each containing a memory word and each having a one-for-one correlation with display addresses. Each memory word has a control field and a data field and can, besides storing a character code defining a character to be displayed, alternatively store a function code defining a regenerative function to be performed. Function codes are placed in only those memory locations, adjacent locations containing character information, which would otherwise contain a space to be displayed.

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Deriving Display Functions by Means of Coded Space Informations

This display system comprises a regenerative display 7 and a memory 1 where the latter provides the information which is displayed. Memory 1 has a plurality of memory addresses each containing a memory word and each having a one-for-one correlation with display addresses. Each memory word has a control field and a data field and can, besides storing a character code defining a character to be displayed, alternatively store a function code defining a regenerative function to be performed. Function codes are placed in only those memory locations, adjacent locations containing character information, which would otherwise contain a space to be displayed.

Addressing means 5 serially steps through each bit location in memory 1 causing at each STEP pulse from control unit 2 a bit of memory word to be read out over output bus 8 to output register 3. Bit detector 12 applies output signal indicative of when the first, second and eighth bit of each word, respectively, is being gated into stage A of register 3. Decoder 14 determines, by examining the control field A, whether a true space function or character exists and generates a control signal indicative of the nature of the word to display 7. The use of control fields allows these memory word locations which normally contain only space indications to be beneficially used to contain function codes.

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