Hey everyone, making some progress here -- thanks for all the tips so far!
Most of the power regulators are fine, but both H745 regulators seem to
be toast. Only getting -1.2 volts; should be -15 and they squeal angrily
when I turn the pot. The surplus shops seem to want $200 for one, so
that's not an option for me.
How does one repair such a beast?
P.S. Also, the main H742s are sagging just a little, but I didn't see an
adjustment on them to bring them up. Anyone know where to look?
> From: Tothwolf
>> Sigh, the crystal output is dead as a doornail. Total flat-line. Guess
>> I'm going to have to find a new one...
> Does it have to be exactly 13MHz for the system to function correctly?
> I have some Fox brand 13.824MHz oscillators
Actually, they are exactly 13.824MHz on the 11/23, too. Must be a standard
> in my parts cabinets that were leftovers from something back in the mid
> 90s (probably modem R&D).
Oh, this may be totally fantastic. I spent a chunk of time today looking for
a replacement, and so far, no luck. So you may really be a life-saver.
A generic search for 13.824MHz crystals turned up a whole bunch of SMD parts,
and a few of what I think are actual crystals (two leads), but none of those
self-contained DIP oscillator units.
I have a couple of 11/23 cards, and although the DIP oscillators on them are
>from a number of different manufacturers, they all have the same number on
them: "18-12131-00", which must be some standard part number. So I tried
looking for that, and all I found were a couple of those part-finder
services. So, just for grins, I asked three of them for quotes. Only one
replied, and they couldn't find them.
So if you've got some of the DIP oscillator units, that'd be a life-saver.
I'll contact you off-list to work out the logistics? Thanks!
You are so absolutely right, you should have been their marketing director
and they'd still be around. People still like to build things just the same!
They completely missed the Maker movement, the computer mod stuff, the
switch to the web. Also too many stores, too small. The stuff they had in
there lately was an appalling mish-mash of uninteresting random stuff. No
need to read the news, you could so clearly see that the company management
was so totally lost and aimless by just visiting a store.
Here in the Valley, Fry's Electronics took over, and then made it so much
better. Fry's is where you stop at lunch time, for amateur or professional
stuff alike, and get an instant replacement for your fried LM7805. It also
keeps our company electronics lab and fab and IT alive. And you can get an
espresso at the same time, and a pack of sugar loaded cookies if you are a
late night programmer. And a concert on a full size Steinway while you are
picking up your capacitor. Let's not forget the best of it, being chased
around by the totally incompetent sales person that will convince you that
SATA and USB are one and the same thing. Trying to lose him by walking
progressively faster. Man, they can walk fast too, these are trained
professionals. And for the grand finale, being stripped searched going out
the door. How is that for the ultimate nerd store experience!
Love it all. The Fry brothers are geniuses.
>RadioShack had it essentially right in the 2014 Super Bowl commercial - the
80s called and they did want their store back. What they screwed up was
thinking that meant >the old store had to go and be replaced with the
>RadioShack should have brought back the store of the 1980s and updated it
items like cheap cables, Raspberry Pi kits, etc. I.E. hobbyist and do it
yourself stuff. Yes, they >still would have to close a number of locations
(do you really need a ratshack on every corner?) but what would have been
left behind would have thrived...
I'm doing some cleaning and purging around my shop, and I have a collection of Xerox 4050 and 4090
printers and parts, plus the controllers for these beasts. Is there any interest at all in this
equipment? I have to get rid of it, soon, but don't want to simply scrap it if there's someone
interested in such niche equipment.
The CPU itself is a DJC11, 11/70 on a chip. Other peripherals include a Bus & Tag online
interface boardset, graphics processor options (I have one seat of each of the two different options
that exist, but the system can only handle one at a time), memory boards, FDDC2 floppy controller
(contains an Intel 8086, plus a set of Western Digital chips), a board dedicated to print controller
to print engine communications, a hard disk interface (up to four MFM disks, in pairs. Originally
had two Fujitsu 56MB disks, later replaced with Seagate drives). The terminal for the system is
either a Lear-Siegler ADM-3A, or a Link Technologies terminal in ADM-3A mode, both with minor
keyboard modifications. (I have several of these terminals on hand.)
Barring interest here, the whole lot will be salvaged and the chips sold off. Keep in mind, this
stuff is big. The individual interface boards are slightly larger than a hex-height Unibus board.
The card cage for the system is about 24" wide, 18" deep, and 30" tall. The complete controller
cabinet, with 9T tape drive, is over 5 feet tall, 3 feet wide, and 2 feet deep.
I also have other equipment and supplies (8" and 5.25" floppies, new in sealed packages, for
example) to move. Everything is located in Wichita, Kansas.
Microfilm Services, Inc.
My employer has over the years ported our main product to more platforms
than I can count. I took inventory of our storage the other day and one
machine has left me clueless: The Concurrent Computer Corporation machine:
As you see it is one rack with a medium sized computer in it. From the
internet and co-workers I've learned that it has either a MIPS or 68k
processor and runs a unix version called RTU, for Real Time Unix. CCC
was initially Interdata, later Perkin Elmer and then spun off into CCC.
Has any cctalk-reader experience with this system? Anything would be
interesting to learn.
This machine might become available in one way or another later this
year. And since I believe it was made in Brittain I've pondered asking
TNMOC if they want it.
Finally, check the content of the directory above for some more Unix
I want to update the EPROMs on my 11/23+, which currently has 2716s. I'm going to need 64k chips, and I understand 2764s won't work on this board.
What are my replacement options? I have a fairly capable programmer, it can probably handle anything with 64k capacity.
I picked up a "large" machine* (for certain definitions of large) that's
currently configured for 220-240V; my house at the moment lacks 220V
receptacles. I was already planning to get an electrician out here to
put in some beefier wiring at some point (I have a couple of machines
that draw 15-20A off of 120V that I'd like to be able to run) but I
wasn't yet planning on doing 220V unless I have to.
(It looks like in theory it's possible to reconfigure the supply for
120V but I lack the docs to do so with any level of confidence...)
I don't know if this machine works, and I'd rather not invest in 220V
wiring quite yet unless it does. And, let's face it, I'm spoiled and I
demand instant gratification and I'd like to know as soon as possible if
this machine is a basket case or not.
So: since all this stuff is in the basement, I'm just about 15 feet
away from the dryer, which at first glance runs off an outlet that meets
my needs. I even have a NEMA 10-30p plug here that I could wire up to
the existing power cable for the computer. But looking into it I have
doubts that it's actually that simple; in particular since this house
was built well before 1996 and so the outlet is not grounded; there's a
neutral lug and two hot lugs (I assume two 120V A/C lines out of phase?)
and I'm guessing that might not sit well with the power supply in this
But then, I'm a rank amateur when it comes to house wiring and A/C and
power supplies and all of that so I thought I'd ask the cctalk
collective whether this can be made to work or if I should simply wait
for a professional to take care of it...
Thanks as always,
* An AMT DAP 610, if you must ask. It's an array processor from the
late 80s, with 64x64 1-bit processors. If the machine doesn't run I'm
pretty much SOL for spare parts, schematics, service manuals, or
anything beyond customer-level documentation (which I've recently
scanned, btw, if anyone's curious...)
Ok.. So Engadget wrote this article claiming Dr. Mark Dean was chief engineer of the 12-person team that designed the original IBM PC in the early '80s
I had always thought it was Lewis Eggebrecht.
I know there were three teams and one of them won and it was Eggebrecht's team.
Did Dr. Marc Dean work on Eggebrecht's team or did he run one of the other ones?
On Fri Feb 6 15:09:42 CST 2015, geneb geneb at deltasoft.com wrote:
> They're in Renton, WA as well. Now if they'd just keep the parts pegs filled...
Yeah, that's been on ongoing issue for Fry's at all of their locations.
I've been to Fry's in San Diego, Las Vegas, both Phoenix locations,
Wilsonville, and of course the one closest to me in Renton.
Great place if you need PC components; they have a lot of odd/unusual items
that you might ordinarily only find on-line, or at PC swap-meets.
You'll find some killer deals there as well. Several years ago,
they were clearing out some 18-gig SCSI Cheetahs.
I picked up 4 of them for $20 each.
However, as mentioned by Gene, they are frequently out-of-stock
on a lot of their electronic components. . . whether it is an obscure item
or commonly-used components. I can never rely on finding
the right value cap or resistor on their shelf.
Another quirk that they have is product placement and pricing.
You might find an audio adapter or cable by one manufacturer
in the components section at one price, and in the audio section
by a different manufacturer, at a significantly different price.
I've also noticed that (at least in Renton) that their selection of generic cables
has decreased, in favor of expensive brands like Monster or Belkin.
Nowadays, I don't even mess with Fry's for A/V or computer cables -- I go straight to MonoPrice.com
On 02/06/2015 11:58 AM, Bill Sudbrink wrote:
> Marc Verdiell wrote:
>> Here in the Valley, Fry's Electronics took over, and then made it so
>> much better. Fry's is where you stop at lunch time, for amateur or
>> professional stuff alike, and get an instant replacement for your
>> fried LM7805.
> A few years ago, there was a rumor that Fry's was going to expand out
> of the Valley. I wonder whether that might happen now that RS is
> on its way out.
Where have you been the last few years?