From: charles.unix.pro@gmail.com (Charles Anthony)
Subject: [TUHS] Command-line options
Date: Fri, 25 Mar 2016 20:09:26 -0700 [thread overview]
Message-ID: <CANV78LSp3o+iAvO8Jnbex1tPMe8c8aidszGpiSr8x5PhNQE+Wg@mail.gmail.com> (raw)
In-Reply-To: <20160326021018.GG897@mercury.ccil.org>
On Fri, Mar 25, 2016 at 7:10 PM, John Cowan <cowan at mercury.ccil.org> wrote:
>
> So they did, but DEC machines in general were always ASCII. The PDP-8
> used both 8-bit characters (ASCII with the high bit set) and 6-bit
> ones (stripped ASCII without control characters or lower-case ones).
> The former were packed three 8-bit characters in two 12-bit words; the
> latter, two characters in one 12-bit word. The PDP-10 packed five 7-bit
> characters into a 36-bit word with one bit left over, which was used
> (if at all) for various purposes. Not until the PDP-11 did the 8-bit
> character get aligned with the machine word size.
>
>
And Dec's RADIX-50, packing 3 characters into 16 bits. (IIRC the origin of
the 6.3 filenames. bit I can't document that.)
-- Charles
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next prev parent reply other threads:[~2016-03-26 3:09 UTC|newest]
Thread overview: 24+ messages / expand[flat|nested] mbox.gz Atom feed top
2016-03-25 14:43 [TUHS] Is the Teletype the unsung hero of Unix? Aharon Robbins
2016-03-25 19:47 ` Jaap Akkerhuis
2016-03-25 21:03 ` Diomidis Spinellis
2016-03-28 20:12 ` scj
2016-04-01 14:06 ` Dave Horsfall
2016-04-01 22:41 ` Greg 'groggy' Lehey
2016-03-25 21:29 ` [TUHS] Command-line options Warren Toomey
2016-03-25 23:25 ` Greg 'groggy' Lehey
2016-03-26 2:10 ` John Cowan
2016-03-26 3:09 ` Charles Anthony [this message]
2016-03-26 19:43 ` Clem Cole
2016-03-26 20:54 ` Ronald Natalie
2016-03-26 22:05 ` John Cowan
2016-03-27 1:25 ` Dave Horsfall
2016-03-27 1:50 ` Charles Anthony
2016-03-27 2:01 ` Greg 'groggy' Lehey
2016-03-27 6:18 ` Random832
2016-03-27 6:57 ` Greg 'groggy' Lehey
2016-03-27 19:38 ` Dave Horsfall
2016-03-27 1:35 ` Greg 'groggy' Lehey
2016-03-26 3:54 ` [TUHS] Is the Teletype the unsung hero of Unix? Greg 'groggy' Lehey
2016-03-26 4:30 ` Steve Nickolas
2016-03-26 5:44 ` Greg 'groggy' Lehey
2016-03-26 8:33 ` Steve Nickolas
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