On 1/05/2010 12:07 AM, Invisible wrote:
> I wonder... What's the bandwidth of a punch-card reader/writer?
Good question but I'm afraid I don't know off hand.
Suppose an 80 column card with 10 bits/column. That is 800 bits per
card. Maybe 20 cards per second through a reader ? Could be higher
since those things were really impressive bits of engineering.
Something like 16K bps ?
Now cards were not generally used for arbitrary data. For example in
many cases cols 73-80 were used for card sequence numbers. Data was
often characters so only 6 or 7 bits of variability for most characters.
Then the readers have to be fed.
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