From: Jon Steinhart <jon@fourwinds.com>
To: TUHS main list <tuhs@minnie.tuhs.org>
Subject: Re: [TUHS] Spider [was: Unix quix]
Date: Wed, 22 Jan 2020 20:31:34 -0800 [thread overview]
Message-ID: <202001230431.00N4VYfb3655315@darkstar.fourwinds.com> (raw)
In-Reply-To: <CAKr6gn2zju=a4tWVt9XgPF_oN3aOibMk=Dc2S-Kh6JXwmO6rjA@mail.gmail.com>
It connected to its hosts via a (discrete TTL-based) microcontroller or “TIU” and seems to have been connected almost immediately
to Unix systems: the oldest driver I have been able to locate is in the V4 tree (https://minnie.tuhs.org/cgi-bin/utree.pl?file=V4/nsys/dmr/tdir/tiu.c). It used a DMA-based parallel interface into the PDP11. As such, it seems to have been much faster than
the typical Datakit connection later - but I know too little about Datakit to be sure.
I have vague memories here that maybe Heinz can help with if his are any better.
I believe that Sandy played a part in "the loop" or "the ring" or whatever it
was called that we had connecting our Honeywell 516 to peripherals. I do
remember the 74S00 repeaters because of the amount of time that Dave Weller
spent tuning them when the error rate got high. Also, being a loop, Joe
Condon used to pull his connectors out of the wall whenever people weren't
showing up to a meeting on time. I don't know whether our network was a
forerunner to the spider network.
Jon
prev parent reply other threads:[~2020-01-23 4:32 UTC|newest]
Thread overview: 4+ messages / expand[flat|nested] mbox.gz Atom feed top
2020-01-22 19:54 Paul Ruizendaal
2020-01-23 1:00 ` Warner Losh
2020-01-23 3:42 ` George Michaelson
2020-01-23 4:31 ` Jon Steinhart [this message]
Reply instructions:
You may reply publicly to this message via plain-text email
using any one of the following methods:
* Save the following mbox file, import it into your mail client,
and reply-to-all from there: mbox
Avoid top-posting and favor interleaved quoting:
https://en.wikipedia.org/wiki/Posting_style#Interleaved_style
* Reply using the --to, --cc, and --in-reply-to
switches of git-send-email(1):
git send-email \
--in-reply-to=202001230431.00N4VYfb3655315@darkstar.fourwinds.com \
--to=jon@fourwinds.com \
--cc=tuhs@minnie.tuhs.org \
/path/to/YOUR_REPLY
https://kernel.org/pub/software/scm/git/docs/git-send-email.html
* If your mail client supports setting the In-Reply-To header
via mailto: links, try the mailto: link
Be sure your reply has a Subject: header at the top and a blank line
before the message body.
This is a public inbox, see mirroring instructions
for how to clone and mirror all data and code used for this inbox;
as well as URLs for NNTP newsgroup(s).