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Quadrahex Coding Disclosure Number: IPCOM000043162D
Original Publication Date: 1984-Jul-01
Included in the Prior Art Database: 2005-Feb-04

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Bannon, RD Minnich, WD [+details]


The method proposed utilizes binary number strings in a six-bit quadrahex code rather than a hexadecimal four-bit code. This results in fifty percent fewer characters to represent a binary string. While hexadecimal denotes a binary base of sixteen, quadrahex denotes a binary base of sixty-four. The code characters are shown in Fig. 1. For example, if used in a keyboard decoded register, the letter "m" would have a binary code of 010101 and an upper case "A" would have 101010. The advantages of utilizing the quadrahex coding system becomes evident in applications such as testing and debugging micro-code patterns used in random-access memory chip registers. In order to test a 72-bit matrix (64 data bits and 8 check bits), 576 ones or zeros are keyed in row by row to complete the matrix.