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From: "Stephen Fuld" <SFuld@alumni.cmu.edu.invalid>
Newsgroups: comp.arch
Subject: Re: PDP-6/10 text, Byte Addressability And Beyond
Date: Wed, 1 May 2024 19:33:54 -0000 (UTC)
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John Levine wrote:


snip

 
> According to MitchAlsup1 <mitchalsup@aol.com>:
> > PDP 10 had a 6-bit "field data" character set and a 9-bit bigger
> > than ASCII character set.
> 
> Dunno what computer that was, but it wasn't a PDP-10.  Univac or
> GE600 maybe?


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.





-- 
 - Stephen Fuld 
(e-mail address disguised to prevent spam)