Hello all,
I'm giving a presentation on the AT&T 3B2 at a local makerspace next month, and while I've been preparing the talk I became curious about an aspect that I don't know has been discussed elsewhere.
I'm well aware that the 3B2 was something of a market failure with not much penetration into the wider commercial UNIX space, but I'm very curious to know more about what the reaction was at Bell Labs. When AT&T entered the computer hardware market after the 1984 breakup, I get the impression that there wasn't very much interest in any of it at Bell Labs, is that true?
Can anyone recall what the general mood was regarding the 3B2 (and the 7300 and the 6300, I suppose!)
-Seth
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Seth Morabito
Poulsbo, WA
web(a)loomcom.com
Around 1985 the computer division of Philips Electronics had a Moterola
68010 based server running MPX (Multi Processor Unix) based on System 5.3
with modification. The 'Multi' part was related to the intelligent LAN and
WAN controllers each with their own 68010 processor and memory. A separate
system image would be downloaded at server boot-time. Truly Multi-Processor
:-)
Here an announcement of the latest (probably last) model, from 1988.
https://techmonitor.ai/technology/philips_ready_with_68030_models_for_its_p…
--
The more I learn the better I understand I know nothing.
> Has anyone roughly calculated “man years” spent developing Unix to 1973 or 1974?
> Under 25 "man-years”? (person years now)
I cannot find the message at the moment (TUHS mail archive search is not working anymore?), but I recall that Doug McIlroy mentioned on this list that 1973 was a miracle year, where Ken & Dennis wrote and debugged over 100,000 lines of code between them. In software, “man year” is an elastic yardstick...
There is also this anecdote by Andy Herzfeld:
===
Quickdraw, the amazing graphics package written entirely by Bill Atkinson, was at the heart of both Lisa and Macintosh. "How many man-years did it take to write QuickDraw?", the Byte magazine reporter asked Steve [Jobs].
Steve turned to look at Bill. "Bill, how long did you spend writing Quickdraw?"
"Well, I worked on it on and off for four years", Bill replied.
Steve paused for a beat and then turned back to the Byte reporter. "Twenty-four man-years. We invested twenty-four man-years in QuickDraw."
Obviously, Steve figured that one Atkinson year equaled six man years, which may have been a modest estimate.
===
There is also another anecdote involving Atkinson. At some point all Apple programmers had to file a weekly report with how many lines of code they wrote that week. After a productive week of refactoring and optimising, he filed a report saying “minus 2,000 lines”.
On DEC's TRU64 UNIX it was /mdec
Making a system image with mkisofs I'd follow with
disklabel -rw -f ${UTMP}/${NAME_ISO} /mdec/rzboot.cdfs /mdec/bootrz.cdfs
Cheers,
uncle rubl
--
The more I learn the better I understand I know nothing.
> From: Dave Horsfall
> MAINDEC was certainly on all of their standalone diagnostic media
Actually, it was the name for all their diagnostics (usually stand-alone),
dating back to the paper tape days - when that was the only form they were
distributed in. So it makes sense that it's a short form of 'MAINDEC'.
Noel
I'm curious about the origin of the directory name /usr/mdec.
(I am reminded of it because I've noticed that it lives on in
at least one of the BSDs.)
I had a vague notion that it meant `DEC maintenance' but that
seems a bit clumsy to describe a place holding boot blocks.
A random web board suggests it meant `magnetic DECtape.'
That's certainly not true by the time I came along, when it
contained the master copy of the disk boot block(s).
But I suppose it could have meant that early on and
the name just carried forward.
A quick skim of the V1-V7 manuals doesn't explain the name.
Anyone have any clearer memories than I do? Doug or Ken or
anyone who was there when it was coined, do you still recall?
Norman Wilson
Toronto ON
