What are these IBM 'thingys'

Roger Holmes roger.holmes at microspot.co.uk
Tue Oct 26 04:28:12 CDT 2010


> From: Al Kossow <aek at bitsavers.org>
> 
> On 10/25/10 7:26 PM, leaknoil wrote:
>> It looks to me like a punch card exactly fits in there and the contacts are what read the holes in the card.
> 
> nope
> 
> cards are read with 12 brushes

Or 80 brushes, I think the holes in cards were made tall and narrow to make reading them that way easier.






More information about the cctalk mailing list