What are these IBM 'thingys'
wdonzelli at gmail.com
Tue Oct 26 23:20:31 CDT 2010
> My father (NOT a computer historian) used to tell me that IBM patented the
> shape of the hole! That resulted in a few short-lived attempts at
> round-hole cards, etc.),
More than a few, actually. There were many, including a trinary one
(Super Bee or something. Anyone help?) that used cards with
information only on the four edges of the card, but the choices were
hole, no-hole, or hole-with-no-outside-edge.
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