Date: 19 May 2022 20:49:51 -0000 From: "John Levine" <johnl@iecc.com> To: freebsd-questions@freebsd.org Subject: Re: Tape, was Single User Message-ID: <t66ahf$128c$1@gal.iecc.com> In-Reply-To: <CA%2ByoEx8Jk_sceftUUuXi5Hq0Vq2TS=dgAgz7cJ5HweF9u0H5Gg@mail.gmail.com> <ff3cbab9-14e3-987c-ef1d-968c3ca31b14@kicp.uchicago.edu> <24632e11-1a86-8553-cf44-d29aa40a6858@kicp.uchicago.edu> <YoaLcXjAkIyqNEQ/@c720-r368166> References: <CA%2ByoEx8Jk_sceftUUuXi5Hq0Vq2TS=dgAgz7cJ5HweF9u0H5Gg@mail.gmail.com> <ff3cbab9-14e3-987c-ef1d-968c3ca31b14@kicp.uchicago.edu> <24632e11-1a86-8553-cf44-d29aa40a6858@kicp.uchicago.edu> <YoaLcXjAkIyqNEQ/@c720-r368166>
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According to Matthias Apitz <guru@unixarea.de>: >El día jueves, mayo 19, 2022 a las 01:43:09p. m. -0400, Valeri Galtsev escribió: > >> I've seen these paper punch tapes too. Don't have them in my museum, just 80 >> column punch cards. and 1/2 inch bobbin of tape. No bobbin tape drive >> though... > >I own such a tape too from my work in the Computer Center of the >University Karl Marx in Leipzig, see here: > >http://www.unixarea.de/simage20170404_071712335.jpg The thing in the picture isn't paper tape, it's a 1/2" magnetic tape. It looks relatively new, 1970s rather than 1950s so it is likely recorded 9 bits across (8 plus parity) at a density of 1600 or 6250 BPI. Here's some 8 bit paper tape: https://commons.wikimedia.org/wiki/File:Punched_paper_tape_roll.jpg -- Regards, John Levine, johnl@taugh.com, Primary Perpetrator of "The Internet for Dummies", Please consider the environment before reading this e-mail. https://jl.ly
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