I'm trying to use simh to create an RT-11 bootable RX50 disk and am
following some instructions posted by Megan Gentry a while ago. I've
created the disk image but am having trouble making it bootable. The
copy/boot command claims it can't find the RT-11 image but it is
clearly on the floppy (du0). Any idea what's going wrong?
RT11XM.SYS 106P 20-Dec-85 DU .SYS 8P 20-Dec-85
TT .SYS 2P 20-Dec-85 PIP .SAV 30P 20-Dec-85
DUP .SAV 47P 20-Dec-85 DIR .SAV 19P 20-Dec-85
RESORC.SAV 25P 20-Dec-85 EDIT .SAV 19P 20-Dec-85
MACRO .SAV 61P 20-Dec-85 CREF .SAV 6P 20-Dec-85
LINK .SAV 49P 20-Dec-85 LIBR .SAV 24P 20-Dec-85
FILEX .SAV 22P 20-Dec-85 HELP .SAV 132P 20-Dec-85
BATCH .SAV 26P 20-Dec-85 FORMAT.SAV 24P 20-Dec-85
SETUP .SAV 41P 20-Dec-85 SPEED .SAV 4P 20-Dec-85
DATIME.SAV 4P 20-Dec-85 LET .SAV 5P 20-Dec-85
SPLIT .SAV 3P 20-Dec-85 CONFIG.SAV 7P 20-Dec-85
SWAP .SYS 27P 20-Dec-85
23 Files, 691 Blocks
95 Free blocks
.copy/boot du0:rt11xm.sys du0:
?DUP-F-File not found DU0:RT11XM.SYS
>Subject: TU-58s (was Re: Some progress with my PDP-11/73 system)
> From: "Ethan Dicks" <ethan.dicks at gmail.com>
> Date: Wed, 11 Apr 2007 21:54:24 -0500
> To: "General Discussion: On-Topic and Off-Topic Posts" <cctalk at classiccmp.org>
>On 4/11/07, Jerome H. Fine <jhfinedp3k at compsys.to> wrote:
>> But I once had a project that
>> used a real DEC TU-58. Not the fastest "random"
>> access device!!!!!!!!!!!!!!!!!!
>They work better as "sequential" access devices - being long and thin
>and travelling in one dimension, go figure. We used to optimize file
>order on our console TU58s to speed up the boot times on our 11/725s
>and 11/730s. Since the file order doesn't change, one just builds a
>TU58 with EXCHANGE with each file following the other. The console's
>8-bit-micro must cache the directory block, since the tape didn't whip
>back to the start between each file.
>Using unaltered console tapes from DEC resulted in, IIRC, about 15
>minutes from turning the key to booting the hard disk. Replacing that
>tape with one of our own devising shortened that pre-boot time to well
>under 3 minutes.
>I'd hate to rely on a TU-58 and no other block-addressable media on a
>PDP-11, though. I survived a PDP-8 with a TD8E and TU56, but it was
>somewhat tedious (cool to watch, though). TU-58s weren't as cool,
So happens one of my "small" pdp-11s uses a Tu58. the system is a BA-11V
with an 11/23 256k of ram, DLV11J and MRV11 rom(boot). Takes 10 minutes
to boot, setup VM: then copy key files to and reboot. After that it's
pretty decent even if I have to access a file on tape.
Everytime I runs it with a bunch of kids of the current PC generations
they go gaga and comment on how slow then I explain the amount of ram and
storage then they are amazed it can be a functional machine with so little.
They can't imagine a useful machine with 32kW of ram and 256kb of storage.
On the flip side I've used that same Tu58 to bring up iron that had no
removable storage. It's slow but very dependable.
Have a working Intel Above Board Plus 8 with 2MB RAM and would like to
populate it to the full 8MB. It will take 120ns or faster 1mbit chips
-- but where can one find that kind of thing nowadays? Are those still
commercially available or am I going to have to scavenge them from
Manual lists acceptable part numbers like:
...etc but google searches haven't been very fruitful (that is, the
pages returned when I search for IC part numbers don't return vendors
with plain pricing/availability info).
I just want a few tubes of these to populate the board, I'm not looking
for a box of 'em :-) Any pointers?
Jim Leonard (trixter at oldskool.org) http://www.oldskool.org/
Help our electronic games project: http://www.mobygames.com/
Or check out some trippy MindCandy at http://www.mindcandydvd.com/
A child borne of the home computer wars: http://trixter.wordpress.com/
I've more of these than anyone will need and they're all brand new.
3 packs of Bernoulli 5.25 44meg disks
KAO 5.25 88meg syquest disks. The label inside says they are formatted for
Macs but includes software for wintel machines also.
$1 each plus whatever for shipping and they're yours. Just say how many you
I am not willing to give up my privacy for the false promise of 'security'
A note to all 2.11bsd users:
Some time ago I looked into running 2.11bsd on systems without
floating point unit. The release notes state that this is untested
and unsupported, and indeed it didn't work.
Robin Birch some time ago fixed part of the issues, see patch 434,
but still the kernel paniced when the very first program was started.
I managed to localize and fix the problem in sys/pdp/mch_fpsim.s.
Steven Schultz right away issued 2.11BSD patch #445. All patches
up to and including 445 are provided by Steven under
A patch level 445 system will now boot on simh for example on a
set cpu 11/70 nofpp 4m
configuration and work just fine, albeit a little slower.
It should thus also work on a real 11/70 without FPP. I heard
of some 11/70 with non-working FPP's, so this maybe good news
for the owners.
With best regards,
Dr. Walter F.J. M?ller Mail: W.F.J.Mueller at gsi.de
GSI, Abteilung KP3 Phone: +49-6159-71-2766
D-64291 Darmstadt FAX: +49-6159-71-3762
"Rawn's Buy & Sell Network" in Burnaby BC (Canada),
says he has a warehouse fill of old computers to
hopefully sell as a lot.
Consists of mostly 80s and 90s systems, like Apple,
Macs, IBMs, Next, Commodore, Atari, Tandy, Hyperion,
etc. as well as tons of software.
Here are some pics he sent me:
Do not contact me, please contact:
rawnsbuysell at lightspeed.ca
Be a PS3 game guru.
Get your game face on with the latest PS3 news and previews at Yahoo! Games.
I have added a few new pictures to the xt/370 web site showing the stacked (and non-stacked) versions of the MCM66128L20, as well as two other examples of IBM engineering that employed stacked chips (AT motherboard and PC memory card) in the early 1980's.
There are 36 pairs on the AT board to get 512K and 18 pairs on the memory card to get 64K.
Obviously, these chips have different pinouts (at least select).
The url is:- www.xt370.net click on the link to the left, 'Memory Technology'
The question a data sheet might answer is:- does one of the new MCM66128L20 parts replace one of the old stacked pairs?
--- also: --
>Subject: Re: Someone in search of XT/370 software
>To: "General Discussion: On-Topic Posts Only" <cctech at classiccmp.org>
>He's on the list. I have at least some of VM/PC, but when I tried to
>email him to let him know, I got an autoresponse from a white-list
>agent, which sent me to an unresponsive URL. It was sufficiently
>irritating that I figured it wasn't worth pursuing further.
>Seriously, folks, if you're going to ask for help, don't make it
>impossible for people to give.
Bear's criticism is well-founded.
I believe I have corrected the problem; I did receive the e-mails and have responded off-list.
At any rate, I greatly appreciate the interest and am sorry for the inconvenience.
As many of you know, the venerable Mike Quinn Electronics in San
Leandro, CA (down by the Oakland Airport) closed last Saturday with
virtually no advance notice. If you're in the San Francisco Bay Area,
you know Mike Quinn is the one of the very last of the nitty gritty
electronics salvage shops left, with an emphasis on gritty.
I stopped by today, and mentioned to Maurice, the owner, that a lot
of people would have liked to have had one last shot at a visit. So,
he has extented an invitation to y'all to visit next week, Tuesday
through Friday February 7-10, 2006, during normal business hours, for
one last shopping spree. He is trying to find a buyer for the stock
in the store. This is almost certainly the last chance to visit. If
you can, it's worth doing whatever you have to do to make the
pilgrimage. Buy some stuff to thank Maurice for keeping it going all
There are zillions of connectors and components, heaps of
transformers and power supplies, scads of cables and keyboards and
monitors and other PC junk, a jet fighter console or two, a couple of
early 80's HP desktop computers (the ones with built-in BASIC, can't
recall the model numbers), lots of relays, and much more, all
arranged in an archaeologically interesting and un-seismically-safe
way. If you need it, they have it, and they might even be able to
Mike Quinn Electronics
401 McCormick Street (at the corner of Adams and McCormick)
San Leandro, CA 94577
Date: Thu, 29 Mar 2007 07:48:55 +1000
From: Doug Jackson <doug at stillhq.com>
Subject: Re: 2708 EPROM progreammer - old magazines designs
John S wrote:
> > As 2708s are obsolete few moern programmers support them, apart from a few
> > that cost many $100s. So I thought why not try and build one? I've found
> > references to the following classic magazines, and I would be willing to pay
> > a small fee for photocopies or scans of the articles:
> > Program your next EROM in BASIC. Schematic for a 2708 erasable read only
> > memory reader and programmer which uses parallel IO ports to set data and
> > address. The software to drive the programmer is written in BASIC.
> > Byte - March 1978 page 84 on (main article)
> > Byte - April 1978 page 62 (Byte Bugs)
I have a programmer designed by Steve Ciarcia from BYTE - It uses an
8051AH-Basic (The 8051 with basic embedded) as the controller - and
still works a treat - to this day. - Standalone board, interface via
serial. It was fun to see peoples faces when you shipped a ^C down the
serial line, and dropped through to a READY prompt.
I can find the doco for yo, but it is a high end solution to a simple
Alternately, I'm more than happy to read an eprom for you, and email
contents - I'm in Oz though. Perhaps there is somebody in the US who
could do the same.
I have one of those as well; alas, it does NOT do 2708's.
To the OP:
I can scan the KB article for you, but the 2708 programmer is
intended to work with a Motorola MEK6800-D2, and consists of
nothing more than 3 transistors to switch the 27V (and a couple
of switches and a socket for the EPROM). It's all done in software.