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CARD_CONVERTER

2017-01-15 05:03  
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CARD_CONVERTER
National MM530B ROM forms basis for conversion of 12-line Hollerith punched-card code to 8-line ASCll. All 12 inputs from cards are presented to programmable logic array (PLA). Invalid input produces all-high output state because it is not recognizable product term. First 7 Hollerith lines, which are ordinary decimally coded lines, are encoded to 3 binary lines with additional logic elements shown, before being presented into common 8-input ROM.- Memory Databook, National Semiconductor, Santa Clara, CA, 1977, p 11-49-11-56.