From mboxrd@z Thu Jan  1 00:00:00 1970
X-Spam-Checker-Version: SpamAssassin 3.4.4 (2020-01-24) on polar.synack.me
X-Spam-Level: 
X-Spam-Status: No, score=-0.3 required=5.0 tests=BAYES_00,
	REPLYTO_WITHOUT_TO_CC autolearn=no autolearn_force=no version=3.4.4
X-Google-Thread: 103376,6353697ffeb79d16
X-Google-NewGroupId: yes
X-Google-Attributes: gida07f3367d7,domainid0,public,usenet
X-Google-Language: ENGLISH,ASCII-7-bit
Path: 
 g2news2.google.com!news2.google.com!npeer02.iad.highwinds-media.com!news.highwinds-media.com!feed-me.highwinds-media.com!news.glorb.com!news2.glorb.com!feeder.erje.net!newsfeed.freenet.ag!news.netcologne.de!ramfeed1.netcologne.de!newsfeed.arcor.de!newsspool2.arcor-online.net!news.arcor.de.POSTED!not-for-mail
From: "Dmitry A. Kazakov" <mailbox@dmitry-kazakov.de>
Subject: Re: Encapsulating Ada.Direct_IO
Newsgroups: comp.lang.ada
User-Agent: 40tude_Dialog/2.0.15.1
MIME-Version: 1.0
Content-Type: text/plain; charset="us-ascii"
Content-Transfer-Encoding: 7bit
Reply-To: mailbox@dmitry-kazakov.de
Organization: cbb software GmbH
References: 
 <5ba4147a-6099-4a05-b548-09544f58247a@j18g2000yqd.googlegroups.com>
 <tM6dnaTzn6shVH7RRVn_vwA@giganews.com> <ic1uop$nhs$1@munin.nbi.dk>
 <8bb3a7c0-c473-4c35-bc6e-3920ce80e6a8@q36g2000vbi.googlegroups.com>
 <1ky7nsia9ahcg$.16m348t3t0y2l$.dlg@40tude.net>
 <ENidndoH8qoqjHvRnZ2dnUVZ_j-dnZ2d@earthlink.com>
Date: Fri, 19 Nov 2010 09:24:40 +0100
Message-ID: <605485uk2kwv.h7xxls3b1ce7.dlg@40tude.net>
NNTP-Posting-Date: 19 Nov 2010 09:24:40 CET
NNTP-Posting-Host: d84c48fe.newsspool3.arcor-online.net
X-Trace: 
 DXC=<c\OQ\__E4=T2Rfi6<W9f5McF=Q^Z^V384Fo<]lROoR18kF<OcfhCO;[QT]DJDV_H0[6LHn;2LCV>7enW;^6ZC`4\`mfM[68DC31d46ODdW3h5
X-Complaints-To: usenet-abuse@arcor.de
Xref: g2news2.google.com comp.lang.ada:16578
Date: 2010-11-19T09:24:40+01:00
List-Id: <comp.lang.ada>

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"
> <mailbox@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 sticking
>>> 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
>> 
> 	Why bother... 5 * 7bit => 35bits, easily fits into a 36bit word with
> one left over!

Because 3*7 = 21 >> 16. Under RSX-11, RT-11 they packed 3 file name
characters into one 16-bit word. With 64K address space that was important.

-- 
Regards,
Dmitry A. Kazakov
http://www.dmitry-kazakov.de