PDP-8 xregs

CusterDD

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Feb 22, 1984, 11:59:00 AM2/22/84

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====
<
< ... on the lowly PDP-8 (with NO index registers) ...
<

I'm astonished! What about the 16 (8 auto incr., 8 auto decr.)
"index registers" in page0? :-)

DEC referred to them as "index registers," (hee! hee!! HAW!!).

And the Time-share 8? I guess CDF and CIF had their benefits, but ...
Talk about inconvenient!!

David Custer
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From: p...@hlexa.UUCP (Paul C. Lustgarten)
Newsgroups: net.jobs
Subject: UN*X Text Processing Supervisor wanted
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Date: Wed, 22-Feb-84 12:01:15 EST
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Posted: Wed Feb 22 12:01:15 1984
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[I am posting this for someone who does not currently have access
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UNIX* Text Processing Supervisor

AT&T Bell Laboratories is looking for an experienced
supervisor with a strong UNIX* background. This is an
administrative position responsible for approximately
40 clerical personnel and 1 professional UNIX Training
Administrator. This person will also be in charge
of applications development in the staff area.
Applicants should have a four year liberal arts degree,
preferably with a graduate degree in business or
computer science.

This location of AT&T Bell Laboratories is in the
beautiful Merrimack Valley, less than one hour
north of Boston. Please send resumes to:

David D. Smith
Group Supervisor, General and Building Services
AT&T Bell Laboratories
1600 Osgood St.
North Andover, MA 01845

AT&T Bell Laboratories is an Equal Employment
Opportunity employer.

* UNIX is a trademark of AT&T Bell Laboratories.

ste...@umcp-cs.uucp

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Feb 23, 1984, 12:03:54 PM2/23/84

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The PDP-8 has 8 page zero auto-inc registers but DG expanded?
this feature? on the NOVA to 8 page zero auto-inc AND 8 page zero
auto-dec registers. Sigh! if they (DG) had only made it possible
to use them so that they mappped to the same locations ... then
we could use them as stack pointers - an indirect thru 20-27 would
auto-inc and 30-37 would auto-dec . Voila stack pointers.
This message brought to you via a NOVA 830, 192kbytes ,RDOS
system.

Stephen Kogge
University of Maryland
Department of Computer Science

Jonathan Biggar

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Feb 23, 1984, 12:06:09 PM2/23/84

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In article <5...@druxp.UUCP> d...@druxp.UUCP (CusterDD) writes:
>====
><
>< ... on the lowly PDP-8 (with NO index registers) ...
><
>
>I'm astonished! What about the 16 (8 auto incr., 8 auto decr.)
>"index registers" in page0? :-)
>
>DEC referred to them as "index registers," (hee! hee!! HAW!!).

There are only 8 auto-increment "registers" on a PDP-8,
(locations 10-17 in page 0), and no auto-decrement "registers".
I should know, I used one for 6 years.

Jon Biggar
{allegra,burdvax,cbosgd,hplabs,ihnp4,sdccsu3,trw-unix}!sdcrdcf!jonab

ron%b...@sri-unix.uucp

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Feb 25, 1984, 6:25:52 AM2/25/84

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From: Ron Natalie <ron@brl-vgr>

I'll never again use a machine with only 8 instructions.

matt%uc...@sri-unix.uucp

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Feb 25, 1984, 7:53:49 AM2/25/84

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From: Matthew J. Weinstein <matt@ucla-locus>

In fact, althought PDP-8's do not, Nova 800's do have 8 auto-increment
and 8 auto-decrement registers (020-027 and 030-037 resp.)