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Path: ...!feeds.phibee-telecom.net!news.mixmin.net!eternal-september.org!feeder3.eternal-september.org!news.eternal-september.org!.POSTED!not-for-mail From: John Savard <quadibloc@servername.invalid> Newsgroups: comp.arch Subject: Re: PDP-6/10 text, Byte Addressability And Beyond Date: Tue, 07 May 2024 19:31:10 -0600 Organization: A noiseless patient Spider Lines: 24 Message-ID: <m5ll3j9d7hd9sa79of8e0o75ejoc0p1638@4ax.com> References: <v0s17o$2okf4$2@dont-email.me> <v0ss9a$31td3$1@dont-email.me> <v0t0eu$32q9v$2@dont-email.me> <b1f23fe4637648d80b2b5e8cbac836da@www.novabbs.org> <v0u24j$20eg$1@gal.iecc.com> <v0u5f2$3bch5$1@dont-email.me> MIME-Version: 1.0 Content-Type: text/plain; charset=us-ascii Content-Transfer-Encoding: 7bit Injection-Date: Wed, 08 May 2024 03:31:12 +0200 (CEST) Injection-Info: dont-email.me; posting-host="f337ba56f9b9ca0be2fd83be8efec5e4"; logging-data="3887425"; mail-complaints-to="abuse@eternal-september.org"; posting-account="U2FsdGVkX19QTGe0pCF+ln0m2lo3ht8jThl7RtASl7Y=" Cancel-Lock: sha1:CZKWB27NkgfQI23wDz0aym2WUfU= X-Newsreader: Forte Free Agent 3.3/32.846 Bytes: 2069 On Wed, 1 May 2024 19:33:54 -0000 (UTC), "Stephen Fuld" <SFuld@alumni.cmu.edu.invalid> wrote: >I don't know about the PDP 10, but you are right that Univac 1108 had >both a six bit (technically a sixth of a word), and nine bit (quarter >word) operations. The 6 bit was Fieldata and used for most older >softwaare. The quarter words held an 8 bit ASCII character with one >"wasted" bit per byte. This became the dominent usage for >applications, but the Exec itself still uses a lot of Fieldata. The PDP-10 used ASCII, and not other codes. The six-bit code of the Univac was derived from FIELDATA, but the actual FIELDATA code, developed by the military, was a 7-bit code which included lower-case. In my cryptography pages, on the page http://www.quadibloc.com/crypto/mi060103.htm there's a diagram comparing Univac's Fieldata code with the actual FIELDATA code. John Savard