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Code Converter Using a Table Look Up and a Dynamic Compare

IP.com Disclosure Number: IPCOM000094820D
Original Publication Date: 1965-Jun-01
Included in the Prior Art Database: 2005-Mar-06
Document File: 2 page(s) / 27K

Publishing Venue

IBM

Related People

Fisk, DE: AUTHOR

Abstract

This is a code conversion system, particularly from BCD to spot matrix, by lookup through stored spot matrices of all characters in the set, i.e., the library. The BCD codes for characters to be displayed are stored in the proper message order in delay line 10 which has a 64-character code capacity.

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Code Converter Using a Table Look Up and a Dynamic Compare

This is a code conversion system, particularly from BCD to spot matrix, by lookup through stored spot matrices of all characters in the set, i.e., the library. The BCD codes for characters to be displayed are stored in the proper message order in delay line 10 which has a 64-character code capacity.

Delay line 12 stores the library. The BCD codes for sixty-four characters and the spot representation of the first, second, third, etc., lines of the corresponding matrices are arranged in the same order as the BCD code. Line 12 has (64 x 11) +1 = 705 character slots so that processing with respect to line 10 occurs. When there is coincidence between any of the BCD codes in the two lines, comparator 14 opens gate 16. This passes an index signal from a gated clock signal source through gate 18 to delay line 20. The latter is 64-character slots in length and is in synchronism with delay line 22 which is 704 slots in length.

The output of line 20 admits through gate 24 the proper spot representations for each line of the character from line 12 into line 22. The spot representation for each line of all characters in the message is thus assembled in the proper order in line 22 to permit displaying the message on a CRT using a standard television type of sweep. Inverter 26 and gate 28 inhibit recirculation in line 20 when new input is to be entered.

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