An 11-punch with a digit indicated a negative number ... We occasionally see new card readers. They rarely, though, work with standard cards.

Enter the punch card sorter and [Ken Shirriff[‘s ... using a radix sort algorithm. The card reader that [Ken] examines in detail uses vacuum tubes and relays to handle the logical operation ...

Punch cards were fed into computers by card readers. Punch cards were synonymous with data processing for about 80 years. Concepts were simple: the database was the file cabinet; a record was a ...

Scan and parse a card-image at The Virtual Card Reader! New: Batch punch, read and process cards using the Virtual Card Read-Punch! A long, long, long, long time ago Before the chips, before the ...