[Mgs] Market opportunity

Hans Duinhoven h.duinhoven at planet.nl
Wed Dec 15 13:15:22 MST 2010


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 at gmail.com>
To: "The Roxter" <rocknatural at gmail.com>
Cc: <mgs at 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 at 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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