That's why Control Data Corp had their 405 card reader equipped with photo
cells, which "read" the holes.
The reader was able to read 2,000 cars per minute and were very reliable!
Massive equipment it was!
http://ed-thelen.org/comp-hist/vs-cdc-405-card-reader.jpg
The CDC 415 card punch had metal brushes as check method for the punched
holes.
Most failing parts were .... the brushes.
http://lh5.ggpht.com/_-rKBal5LY1U/SUZCc9X3H7I/AAAAAAAAAvs/147L310EKio/1978_ICCC_CardPunch.jpg
Cheers,
Hans
----- Original Message -----
From: "Paul Root" <ptrmgb@gmail.com>
To: "The Roxter" <rocknatural@gmail.com>
Cc: <mgs@autox.team.net>
Sent: Wednesday, December 15, 2010 3:45 AM
Subject: Re: [Mgs] Market opportunity
> This is way off subject, and I'll probably get yelled at, but EBCDIC code
> was
> formed the way it was with the big gaps because the original card readers
> would get jammed with cards that had holes in those places.
>
> On Dec 14, 2010, at 6:52 PM, The Roxter wrote:
>
>> On 12/14/2010 3:58 PM, mgbob@juno.com wrote:
>>> Rocky,
>>> Why the abrasive in the card stock? Was that to keep the brushes clean
>>> as
> cards passed them?
>> Something like that, kept the card feed chutes clean, etc.
>>
>> -Rocky Frisco
>> --
>> _______________________________________________
>>
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>
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