With permission, I?m forwarding this email about a Xerox 820-II that?s available in Regina, Saskatchewan, Canada. (I live in Regina, and know Steven.)
Feel free to contact him directly. He?s also available by IRC; email me directly for server details.
Jim
From: Steven Brown [mailto:tuxsteve at gmail.com]
Sent: Wednesday, November 13, 2019 10:01 PM
To: buysell at losurs.org; Q&A LOSURS <q&a at losurs.org>
Subject: [LOSURS: buysell] Xerox 820 PC
My dad worked at Xerox for over 20 years here in Regina. A former co-worker of his called him to see if he knew anyone who might be interested in taking ownership of a Xerox 820 he has.
Still works apparently.
Specs can be found here:
https://oldcomputers.net/xerox-820.html
He sent along the following information:
"
This is a xerox 820 II antique, black & white screen, 8? HD and a dual 8? floppy unit, has the 8 and 16 bit intel processors.
If one was interested in playing with the old stuff.
Tried to give it to Western Development museum but they only want stuff that relates to Saskatchewan.
Oh yes it is a com base operating system
"
He mentioned it comes with a pile of software as well.
Picture sent isn't very good but here it is:
https://imgur.com/a/CzH5FHz
If anyone is interested please let me know. If anybody knows of a person or institution who may be interested, please let me know.
Regards,
Steven Brown
Hi everyone,
I'm planning to expand my MAME-based emulation of Intel MDS-II systems
with the support for double-density floppy disks. In particular, I'm
thinking of emulating the isbc202 floppy controller because its
architecture looks very interesting. This board was based on Intel's own
3000-series bit-slices.
A necessary step for this work is finding the image of the 4
microprogram PROMs on the controller board. Has anyone on this list ever
dumped these memories, please? Can you share the binary images with me?
Of course, I'm going to properly credit you in the emulator sources.
AFAIK this would be the first emulation of a Intel 3000 system.
A side question: do you happen to know if the Intel CROMIS assembler for
3000 series has ever been preserved somewhere on the Net? The manual
says it was provided to user as a set of FORTRAN IV sources.
Thanks in advance for your help.
--F.Ulivi
Does anyone have a copy of this, or something similar? Prefer digital
format, if possible.
Jameco Part number 159791 $29.95 61140 SEMICONDUCTOR CROSS REFERENCE on
CD-ROM Enhanced Version A complete guide to semiconductor replacement and
substitutions from the makers of PHOTOFACT(R) service documentation. More
than 490,000 part numbers, type numbers, and other identifying numbers
listed. Includes part numbers for the United States, Europe, and the Far
East. Covers all major types of semiconductors: bipolar transistors, FETs,
diodes, rectifiers, ICs, SCRs, LEDs, modules, and thermal devices.
Replacement for NTE, ECG, Radio Shack, and TCE - four cross references in
one! Up-to-date list of original equipment manufacturers. The most
comprehensive replacement data available for engineers, technicians, and all
those who work with semiconductors. Minimum System Requirements: Windows
95(R) or higher and 60 MB of free disk space C 1998 Howard W. Sams. All
Rights Reserved. http://www.hwsams.com
Thanks!
Cindy Croxton
On 11/11/19 12:27 AM, Eric Moore via cctech wrote:
> Hello, I have a working AED WINC08 drive, which is a winchester drive
> emulated to look like an RL02, along with the qbus controller card.
>
> https://archive.org/details/bitsavers_aedbrochurJan82_2107642/page/n1
>
> The winchester drive itself is a fujitsu M2302B. One of the disks (it shows
> up as 2 10MB volumes in RT-11) is having write issues. How can I find a
> replacement disk drive in working order? The 2302b has a shugart compatible
> interface, so should any shugart compatible 8" winchester drive work in the
> aed winc08 rl02 emulator?
>
> What other options do I have to attach a winchester drive to an 11/03 for
> use in rt-11? I have an RL02 I have never hooked up, do the disk packs hold
> up well over time? How hard is it to clean and align an 8" winchester drive
> to try and address the write issue?
>
> Thank you,
>
> -Eric
In my (pre) historic use of products similar to this one, it was rare to swap the vendors drive with a completely different drive. The controllers, their electrical interfaces and recording formats were tightly coupled to the disk drives implemented.
My suggestion would be to look for a QBus SCSI Controller like the Emulex UC07 or Dilog SQ739, though both are a bit pricey. These open up a large number of drives to use and later versions of RT11 support the MSCP protocol the controllers emulate. The use of the SCSI2SD drive emulator gives even more flexibility through the use of microSD cards. Google around for both.
I have an pair of RL02 drives. I keep them clean and power them up for short periods regularly. You need to be alert to potential issues with electrolytic capacitors drying out and causing problems in the power supplies and circuit boards of all devices of from this era. See http://www.vcfed.org/forum/showthread.php?72247-Dismantle-an-RL02-pack for a recent discussion and pictures of some of the material in the packs decaying over time.
Jerry
Hi all --
The VAX-11/730 we have running here at the museum has developed a fault
that occurs only sporadically, usually days apart. Running the complete
diagnostic suite for the better part of a week reveals this:
SECT TST ERR EXP REC OTHER MSK MODULE
ENKCC 33 08 000000FF 000000DF N/A FFFFFF00 M8391 M8728
Re-running only ENKCC, this error is repeatable (though it still takes a
couple of days for it to occur). It helpfully points out the MCT (M8391)
and memory boards (M8728) as possible causes; we have spare M8728s and I've
swapped them around with no change in behavior. I have a spare M8391 in my
own collection but it fails in a completely different way so that's not
much help.
I cannot find any real documentation for ENKCC so I don't know what TEST 33
is doing, nor what ERROR 8 indicates in this context, though it seems we're
dropping a bit somewhere :). Anyone out there sitting on a pile of 11/730
documentation?
Thanks as always!
- Josh
Folks,
Any one got any interest in any dot-matrix printers. Got a Panasonic wide
carriage, DEC narrow carriage, and a Tandy DMP200..
Dave Wade
G4UGM & EA7KAE
Just wondering if anyone on the list is going after these 1973 Remex manuals for the PDP-11 interface
to their reader/punch units?
https://www.ebay.com/itm/274092453978https://www.ebay.com/itm/274092431915
I have two of the reader-only version of this board I bought relatively cheap off eBay some years ago
and would be happy to trade or pay for a scanned copy if required. As I don't have a Remex reader/punch
it would save me bidding up the price unnecessarily.
Steve.
