3 Apr
2010
3 Apr
'10
11:14 p.m.
Rich Alderson wrote:
From: Chuck Guzis
Sent: Thursday, April 01, 2010 10:47 AM
I've always remembered it as 12-edge first, and was told that was
considered the "correct" card orientation for processing cards in the
early days, but ICBW.
Later,
Charlie Carothers
On 1 Apr 2010 at 13:18, M H Stein wrote:
> As a matter of fact reading the card
'sideways' was a basic principle
> of the electro-mechanical punched card systems that (along with card
> sales) were IBM's bread and butter until the mid-sixties.
Now that I think of it, all of the earlier IBM
equipment, with the
exception of card punches, were fed long-edge on, right from all of
the unit (sorters, 407 accounting machine, 519 reproducing punch)
record equipment, through peripheral card readers, such as the 1402
and 1622. But the 2501, ISTR was "short edge on"--or at least that
was the way the cards were ejected into the stacker.
I imagine that "long edge on" helped
greatly to improve the
throughput at the expense of greater complexity.
And thus the ancient IBMer joke that Thomas Watson Sr. was buried
"face down, 9-edge first".
Rich Alderson
Vintage Computing Sr. Server Engineer
Vulcan, Inc.
505 5th Avenue S, Suite 900
Seattle, WA 98104
mailto:RichA at vulcan.com
mailto:RichA at LivingComputerMuseum.org
http://www.PDPplanet.org/
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