Vintage Computer Hollerith IBM Punch Card with Square Corners -NEW old Stock NOS For Sale

Vintage Computer Hollerith IBM Punch Card with Square Corners -NEW old Stock NOS


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Vintage Computer Hollerith IBM Punch Card with Square Corners -NEW old Stock NOS:
$0.99

BUY 2 get 1 FREE (limited time offer)IBM 80 Column SQUARE corners DATA Key-Punch Cards (Hollerith)
You are offerding one VINTAGE IBM (Hollerith) punch card. Since punch cards were used in the 1890 census, virtually all punch cards had square corners, until IBM changed to rounded corners in 1964. My cards have SQUARE corners.I originally purchased In bulk 2000 per box, in the early 1970's. The cards have never been used, or for that matter out of the original box. These are clean, unused, and show absolutely no visible signs of aging.IBM (Hollerith) punch cards 80 columns of 12 positions (0-9 + 2 zone)
IBM cards are exactly 7 3?8 by 3 1?4 inches and 0.007 inches thick.FORTRAN program statements had this format:Column 1 – Comment - usually marked with a “C”Column 1-5 - Line Number – usually used with format statementsColumn 6 - Continuation of statement on previous cardColumn 7-72 - the actual FORTRAN code ( latter systems used 7-80 )Column 72-80 – Sequence or Identification number
When cards were to hold data, the format was free form.
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