> On Feb 13, 2020, at 12:17 PM, Robert Thomas <r...@asthomas.com> wrote:
>
> ...
> The Documation card reader was fairly reliable and didn't chew up as many
> cards as the IBM reader.
I can believe that. The IBM card readers and punches I've seen (on a 360/44)
had a pick mechanism that moves a metal block with a small step in it, sized to
match the nominal thickness of the card. This was supposed to catch the far
edge of the card and *push* it into the throat of the feed mechanism. If there
was anything slightly wrong, it would accordeon-fold the card instead.
The Documation readers had vacuum operated pick mechanisms that acted on the
leading edge of the card.
paul
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