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From: Adam Beneschan <adam@irvine.com>
Newsgroups: comp.lang.ada
Subject: Re: Encapsulating Ada.Direct_IO
Date: Fri, 19 Nov 2010 08:19:25 -0800 (PST)
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Date: 2010-11-19T08:19:25-08:00
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On Nov 19, 12:24=A0am, "Dmitry A. Kazakov" <mail...@dmitry-kazakov.de>
wrote:
> On Thu, 18 Nov 2010 21:57:10 -0800, Dennis Lee Bieber wrote:
> > On Thu, 18 Nov 2010 18:05:49 +0100, "Dmitry A. Kazakov"
> > <mail...@dmitry-kazakov.de> declaimed the following in comp.lang.ada:
>
> >> On Thu, 18 Nov 2010 08:31:20 -0800 (PST), Adam Beneschan wrote:
>
> >>> Then there was a
> >>> DEC machine that used 36-bit words and represented strings by stickin=
g
> >>> five 7-bit ASCII characters in each word, but I don't remember much
> >>> else.
>
> >> RADIX-50?
>
> >>http://en.wikipedia.org/wiki/DEC_Radix-50
>
> > =A0 =A0Why bother... 5 * 7bit =3D> 35bits, easily fits into a 36bit wor=
d with
> > one left over!
>
> Because 3*7 =3D 21 >> 16. Under RSX-11, RT-11 they packed 3 file name
> characters into one 16-bit word. With 64K address space that was importan=
t.

Yeah, I remember the -11.  Cute little machines.  The 36-bit one I was
referring to was, I think, DEC-10; my recollection is that the
instruction set contained instructions that would let you stuff
characters of any size (including 7 bits) into words until it couldn't
fit any more and then go to the next word.

                                   -- Adam