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- From: ram@cs.umb.edu (Robert Morris)
- Newsgroups: misc.forsale.computers
- Subject: Re: AT&T Unix PC
- Message-ID: <RAM.92Jul21234249@ra.cs.umb.edu>
- Date: 22 Jul 92 04:42:49 GMT
- References: <CIAMAC.92Jul13132631@picadilly.media.mit.edu> <1992Jul18.005242@aminet.uucp>
- Sender: news@cs.umb.edu (USENET News System)
- Reply-To: ram@cs.umb.edu
- Followup-To: misc.forsale.computers
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- Organization: University of Massachusetts at Boston
- Lines: 95
- In-Reply-To: barrett@aminet.uucp's message of 18 Jul 92 00: 52:42 GMT
- Nntp-Posting-Host: ra.cs.umb.edu
-
- In article <1992Jul18.005242@aminet.uucp> barrett@aminet.uucp (Keith Barrett) writes:
-
- Xref: news.cs.umb.edu misc.forsale.computers:41212 ne.forsale:8601
- Path: news.cs.umb.edu!hsdndev!wupost!uunet!olivea!isc-br!bunker!nuconvex!aminet!barrett
- From: barrett@aminet.uucp (Keith Barrett)
- Newsgroups: misc.forsale.computers,ne.forsale
- Date: 18 Jul 92 00:52:42 GMT
- References: <CIAMAC.92Jul13132631@picadilly.media.mit.edu>
- Sender: news@aminet.uucp
- Reply-To: barrett%aminet@nuconvex.com
- Followup-To: misc.forsale.computers
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- Organization: Waterbury USENET/UUCP
- Lines: 26
- X-Copyright: (c) 1992 Keith Barrett; May be distributed freely, Not for sale
- X-Disclaimer: Statements expressed are not representitive of any employer
- X-NewsSoftware: XRN V6.17 Amiga UNIX SVR4
-
- I apologize in advance for this, but this makes no sense:
-
- In article <CIAMAC.92Jul13132631@picadilly.media.mit.edu>, ciamac@picadilly.media.mit.edu (Ciamac Moallemi) writes:
- >
- >AT&T Unix PC for sale -
- > 1 MB Memory
- > 20 MB Hard Drive
- > 5.25 in Floppy
- > 1200 Baud Modem
- > Full Manual Set
- > Tons of Extra Software Pre-Loaded
- >
- >A great home unix box. $300 or best offer.
-
- UNIX requires an absolute minimum of about 60 meg disk, and about 3-5 meg
- of memory. Plus it would take a lot of 5.25" floppies. There is no way this
- system could ever have supported UNIX. Am I missing something here?
-
- You are missing facts and history.
-
- The UNIX PC's have dynamically linked libraries, which is one reason
- why they can use less disk space than classical bloated unix systems.
- Not to mention that System V comes with so little functionality
- compared to Berkeley unix that not much space is needed. Still, these
- things do fine for minor C development and we even painfully taught
- graphics on them, using uucp to our Sun network to support printing
- and mail. If I'm not mistaken, most gnu tools will run on them (not
- hard, since they have a 68010 processor).
-
- Here's our UPC guru's reply to my query about address space and
- whether the UPC did dynamic linking:
-
- Date: Tue, 21 Jul 1992 22:14:10 -0400
- From: eoneil@ra.cs.umb.edu (Betty O'Neil)
- To: ram@cs.umb.edu
- Subject: Re: UNIX PC's
-
- Yes, both for dev drivers and shared libraries. The 4th M of 4 M
- of VM is used for this. The kernel is in the first .5 M, the user
- image in the 2.5M in the middle. The video ram, PT, i/o regs are
- all above that in the address space. This is all about UNIX on the
- UPC, of course. 20Mb however is a common disk size, not clearly
- related to all this.--Betty
-
-
- Note also that Version 6 and 7 unix all fit happily on much smaller
- machines. In 1978 we ran unix on a PDP11 which had 256kB of memory and
- two 5mB disks. The machine stood in a 6 foot high 19" rack, somewhat
- bigger than our Sun 4/490 with 3gB of disk, 64mB of memory and a tape
- drive. It supported 8 logins and tolerated 2-3 compilations or 2-3
- active emacs's running (Can you old-timers say "Teleray 1061"? Gee
- whiz, that thing is still in the termcap file! No _wonder_ unix is so
- big. It's whole history is written in all its support files. If I look
- hard enough will I find directories named "ken" and "dmr" in the
- kernel string tables?)
-
- As to the UPC's we found the drive's to be somewhat unreliable, but
- generally replacable for around $25-40 (we recently bought some at Eli
- Hefron).
-
- Betty ported Xinu to these machines, the boards from which we now use
- as standalone Xinu machines for OS courses. You can get her source
- code with anonymous ftp to ftp.cs.umb.edu in directory /pub/xinu7300
-
- A bit more history: AT&T originally tried to sell these machines for
- about $4000(?) in 1986(?). They ended up donating a ton of them to
- universities. For example, at that time we made a grant proposal to
- AT&T for 10 3B2/400 machines--approximately a Sun3 class machine with
- a BLIT terminal---and were awarded 8 3B2's and ___40___ Unix PC's (we
- didn't ask for _any_). This was a common experience. About the same
- time, the street price for them was about $900, so I suppose AT&T
- couldn't even give them all away. The hardware was made by Convergent
- Technologies, reasonably competently.
-
-
- Bob Morris
- ram@cs.umb.edu
-