Liste des Groupes | Revenir à cl c |
Tim Rentsch <tr.17687@z991.linuxsc.com> writes:
>scott@slp53.sl.home (Scott Lurndal) writes:>
>scott@slp53.sl.home (Scott Lurndal) writes:>
>Tim Rentsch <tr.17687@z991.linuxsc.com> writes:>
>Keith Thompson <Keith.S.Thompson+u@gmail.com> writes:>
>IBM developed 80-column cards, with the same overall size, in>
the late 1920s. Apparently 80 just happened to be the number
of rectangular holes that could reasonably be accommodated
[...]
We don't know that. The same size might have accommodated 85
columns, but was revised down to 80 for other reasons. Or the
same size might have accommodated only 77 columns, but it was
discovered that 80 columns could work if a different card
material was used. The form factor was one constraint, but
not the only constraint, and not the only consideration.
I have a hardcover book about punched cards somewhere
in storage - came from the Burroughs library when they
closed it. I'll try to dig it out if I get a chance.
>
Casey, Robert S. and Perry, James W. Editors
Punched Cards - Their application to science and industry
https://archive.org/stream/
PunchedCardsTheirApplicationsToScienceAndIndustry/
Punched_cards-their_applications_to_science_and_industry_djvu.txt
A remarkable document. Thank you for the link.
The hardcover has nice B&W pictures of most of the gear.
>
The text document on archive.org is a poorly formatted scan thereof.
Les messages affichés proviennent d'usenet.