Path: ...!weretis.net!feeder9.news.weretis.net!news.quux.org!eternal-september.org!feeder3.eternal-september.org!news.eternal-september.org!.POSTED!not-for-mail From: Sarr Blumson Newsgroups: comp.arch Subject: Re: Where did CKD disks come from? Date: Mon, 23 Dec 2024 18:40:27 -0000 (UTC) Organization: A noiseless patient Spider Lines: 22 Message-ID: References: <87h678l5to.fsf@localhost> Injection-Date: Mon, 23 Dec 2024 19:40:27 +0100 (CET) Injection-Info: dont-email.me; posting-host="3541741cf424a8751ce472e3f311e717"; logging-data="1394968"; mail-complaints-to="abuse@eternal-september.org"; posting-account="U2FsdGVkX1/Ffsq2Y6VvaMPk6r71GtmA" User-Agent: tin/2.6.2-20221225 ("Pittyvaich") (NetBSD/9.3 (amd64)) Cancel-Lock: sha1:ZwaXldXPn4SFphq9gRwdtYJqdq4= Bytes: 1857 EricP wrote: > John Levine wrote: > > BTW if you want to see a weird piece of storage hardware, > take a gander at the chapter on 2321 Data Cell Drive. > It has a rotating drum with cards in slots that move up and down > to be read, kind of like the old slide projectors, > and each card has 10 magnetic stripe > > http://www.bitsavers.org/pdf/ibm/2841/ > > http://www.bitsavers.org/pdf/ibm/2841/A26-5988-0_2841_2311_2321_7320_Descr.pdf In 1969 I was a TA for intro programming with ~300 studemts at Michigan. The Computer Center had just bought a DataCell and, because they intended it for archival storage, made it cheap. So we, being budget conscious, put the course files for out final problem on it. During finals week. MTBF was about 20 minutes. Great unhappiness. -- sarr@sdf.org SDF Public Access UNIX System - http://sdf.org