HP3000-L Archives

May 2014, Week 4

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Subject:
Re: Tape to Punched Cards
From:
Stan Sieler <[log in to unmask]>
Reply To:
Stan Sieler <[log in to unmask]>
Date:
Fri, 23 May 2014 10:03:04 -0700
Content-Type:
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Re:

> The "crunch card" was a binary-punched card (you couldn't possibly
> accidentally punch one on a keypunch).  It was also completely

Some computer I used, probably the Burroughs 6500,
used a 1 & 2 overpunch as a control card.  (Punch a one, backspace,
punch a 2 ... an illegal combination).
Years later, IIRC, I discovered why: it caused the card reader
to signal an exception to the main CPU.

Perhaps there was a similar underpinning to your crunch card?

Stan

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