comp.lang.ada
 help / color / mirror / Atom feed
From: Robert A Duff <bobduff@world.std.com>
Subject: Re: Streams in Ada
Date: Fri, 13 Apr 2001 23:21:59 GMT
Date: 2001-04-13T23:21:59+00:00	[thread overview]
Message-ID: <wcc7l0ocrmw.fsf@world.std.com> (raw)
In-Reply-To: 5FW3+dkM46AZ@eisner.encompasserve.org

Kilgallen@eisner.decus.org.nospam (Larry Kilgallen) writes:

> In article <wccg0frw5se.fsf@world.std.com>, Robert A Duff <bobduff@world.std.com> writes:
> > "Marin David Condic" <marin.condic.auntie.spam@pacemicro.com> writes:
> > 
> >> The PDP-10 was more closely oriented to "Sixbit" characters. (Or
> >> "Half-ASCII" - basically ASCII with the lower case & some other stuff gone.)
> >> IIRC, the Tops-10 OS had the 6x3 file name restrictions basically because it
> >> would make filenames fit with Sixbit & into even multiples of machine words.
> > 
> > This is more a property of Tops-10 than the PDP-10 hardware.
> > 
> > The hardware supported "bytes", which could be from 1 to 36 bits each --
> > there's nothing special about 6-bit bytes.
> 
> 6-bit bytes were adequate to meet the needs of the time.
> As I recall, ITS (Incompatible Timesharing System), which
> predated Tops-10, used 6x6 filenames.

You seem to be implying that "bytes" are always used to represent
"characters".  On the PDP-10, 6-bit bytes were used to represent 6-bit
characters, and 7-bit bytes were used to represent 7-bit ASCII, and
1-bit bytes were used to represent booleans, and 3-bit bytes were used
to represent enumeration types with 8 values, and so on.

- Bob



  parent reply	other threads:[~2001-04-13 23:21 UTC|newest]

Thread overview: 50+ messages / expand[flat|nested]  mbox.gz  Atom feed  top
2001-03-31 14:49 Streams in Ada chris.danx
2001-03-31 15:22 ` chris.danx
2001-03-31 21:37   ` Jeff Creem
2001-03-31 21:49     ` chris.danx
2001-03-31 22:21       ` Robert A Duff
2001-03-31 22:33         ` chris.danx
2001-04-02 13:47         ` Ted Dennison
2001-04-02 14:03           ` Florian Weimer
2001-04-02 14:29             ` Ted Dennison
2001-04-02 14:54               ` Robert A Duff
2001-04-02 14:47             ` Marin David Condic
2001-04-02 15:10               ` Florian Weimer
2001-04-02 15:49                 ` Ted Dennison
2001-04-02 16:57                   ` Marin David Condic
2001-04-02 17:43                     ` PDP-10, was " tmoran
2001-04-02 17:49                     ` Robert A Duff
2001-04-02 22:09                       ` 6-bit characters (was: Re: Streams in Ada) Jeffrey Carter
2001-04-02 23:29                         ` Robert A Duff
2001-04-03 16:41                           ` Jeffrey Carter
2001-04-03 17:57                             ` Florian Weimer
2001-04-03 18:19                               ` Marin David Condic
2001-04-05 18:37                                 ` Tucker Taft
2001-04-03 18:04                             ` Marin David Condic
2001-04-06 22:40                             ` Robert A Duff
2001-04-03 14:10                         ` Marin David Condic
2001-04-03  1:57                       ` Streams in Ada Larry Kilgallen
2001-04-03 14:13                         ` Marin David Condic
2001-04-13 23:21                         ` Robert A Duff [this message]
2001-04-02 17:41                   ` Florian Weimer
2001-04-02 18:17                     ` Robert A Duff
2001-04-02 19:36                       ` Marin David Condic
2001-04-02 20:54                         ` Robert A Duff
2001-04-03 10:10                         ` Florian Weimer
2001-04-03 14:21                           ` Marin David Condic
2001-04-03 18:15                             ` Florian Weimer
2001-04-03 23:21                               ` Robert A Duff
2001-04-02 21:13                       ` Florian Weimer
2001-04-02 21:22                         ` Robert A Duff
2001-04-03 10:02                           ` Florian Weimer
2001-04-02 16:42                 ` Marin David Condic
2001-04-13  5:00                 ` David Thompson
2001-03-31 20:48 ` James Rogers
2001-03-31 21:20   ` chris.danx
2001-03-31 21:22     ` chris.danx
2001-03-31 23:10     ` David C. Hoos, Sr.
2001-04-01 11:27       ` chris.danx
2001-04-02 14:12     ` Ted Dennison
2001-04-02 14:00   ` Ted Dennison
  -- strict thread matches above, loose matches on Subject: below --
2001-04-05 14:24 Brian Gaffney
2001-04-06 22:54 ` Robert A Duff
replies disabled

This is a public inbox, see mirroring instructions
for how to clone and mirror all data and code used for this inbox