>BTW, I've seen a few non-name SIMMs with dry joints between the
>surface-mount chips and the carrier board. Resoldering those
was an
>entertainment...
>
>Probably more on-topic for this list is a 30 pin SIMM that I
have in my
>spares box. It's 256K*9, using pin-through-hole chips (normal
41256 DRAMs
>in 16 pin DIP packages). It does use the normal SIMM pinout
AFAIK.
Those are adapter boards to convert old DIP DRAMS into SIMMs. I
did a bunch when 1MB SIMMs were $50 each. There are still
places that sell them, JDR in California for one.
Jack Peacock
i've got a PCRT, the desktop form factor, but i need the proprietary keyboard.
any leads?
david
In a message dated 98-03-13 13:17:41 EST, you write:
<< PC/RT?
Anyone want to get rid of one?
Thank you,
David Wollmann
dwollmann(a)ibmhelp.com
DST ibmhelp.com Technical Support >>
The reason why people think it's "illegal" to solder PC parts is
because high temeratures can damage semiconductors, or so it says on
every soldering guide I have ever seen. That's what those heat sinks
are for. Now about the sockets, I'd imagine quite a few SIMMS were
broken trying to fit them in. While mostly, it's easy, I had to
pound on some DIMMS I was installing into 10 Macs recently. By the
way, does anyone want an Orchid RAM expansion board for a PS/2?
Sorry, no driver files or anything. I will give it for free. AFAIK,
it works and has either 1, 1.5, or 2 MB RAM on it.
>
>I've seen this stated on several newsgroups as well, but I can't
>understand why it's impossible to solder a new SIMM socket onto a
>motherboard. You can break up the old one, desolder the pins one at a
>time, fit a new one (I've seen them on sale in the UK), and solder it
in.
>Takes about 10 minutes. I've done it before now.
>
>There is a myth doing the rounds that it's impossible to use a
soldering
>iron on PC parts. I don't know where it came from, but it's 100% false.
>
>BTW, I've seen a few non-name SIMMs with dry joints between the
>surface-mount chips and the carrier board. Resoldering those was an
>entertainment...
>
>Probably more on-topic for this list is a 30 pin SIMM that I have in my
>spares box. It's 256K*9, using pin-through-hole chips (normal 41256
DRAMs
>in 16 pin DIP packages). It does use the normal SIMM pinout AFAIK.
>
>I think it came from an Amstrad machine, and I think there are diagrams
>of them in some Amstrad service manuals.
>
>
>-tony
>
>
______________________________________________________
Get Your Private, Free Email at http://www.hotmail.com
I got into the web site today, out of interest, and went as far as the
registration page which is working today. They want $35 per month from
foreigners just to enter the site :-(
Regards
Pete
I used to populate the XMS cards with 256K DRAM as well, largest being
2MB (72 chips). As I recall, the 256K DRAM dips were down to about
$2.50~$3.50 a pop when our benevolent Congress stepped in to help us
and the price rose to the $12.00+ range. I was impressed. We had
orders to fill and were being burned bad.... those weren't the days.
Marty Mintzell
______________________________ Reply Separator
_________________________________
Subject: Re: Getting bent (ON topic if not thread)
Author: classiccmp(a)u.washington.edu at internet
Date: 3/13/98 3:17 PM
At 12:52 3/13/98 -0600, David wrote:
>256K DRAMs bring back all sorts of bad memories. We used to sell 384K
>expansions for the PCjr....Not only were they hell to populate, but when
>the DRAM prices went through the roof, we were only selling a few at ~$300
>a pop.
The thing about those Everex 3MB XMS cards was, I actually did several of
them (groan) with DRAM I'd stocked up on. At the worst of the RAM spike,
the best price I could have gotten on 256K DRAM was US$12.45 per chip.
Which made those d**n Everex cards worth, nominally, over $1300 each....
but we just gritted our teeth, because a 9-chip 1MB 30-pin SIMM was $595!
__________________________________________
Kip Crosby engine(a)chac.org
http://www.chac.org/index.html
Computer History Association of California
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To: "Discussion re-collecting of classic computers"
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Subject: Re: Getting bent (ON topic if not thread)
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On Mar 13, 12:52, David Wollmann wrote:
> Now we just have to worry about busting the cheap plastic
> retainers on some of the older sockets. I hate it when I have to trash a
> mobo for a busted SIMM socket.
They're not usually very hard to replace. I've fixed at least two motherboards
such as you describe by using the SIMM sockets swiped from one that really was
DBR. Even new SIMM sockets aren't expensive.
--
Pete Peter Turnbull
Dept. of Computer Science
University of York
I know there has already been a discussion on the Sony SMC-70, but it seems
to have terminated after being sidetracked into a discussion of floppy
connectors.
I've stumbled upon quite a large collection of Sony modules for these
things. This is currently what I have sitting in front of me:
SMC-70G Micro Computer
??????? Genlocker
SMI-7012A Dual Floppy Unit
SMI-7074 NTSC Superimposer
SMI-7050 Cache Disk Unit -- What is this?
SMI-7075 Videotizer
Now, is there anywhere that I can get an OS and the software to use all that
equipment with? Can someone 'lend' me images of thier floppies? (If anyone
has them!)
The main computer module is fuctional -- I can boot it to the point where I
get a console monitor and get type 'b' and get into 'Sony BASIC'. I don't
currently have enough RGB NTSC video equipment to test the rest out.
Thanks,
Adam
( Adam Fritzler afritz(a)iname.com )
http://afritz.base.org/
Anyone remember how to set the default boot drive on a Sun3?
This is not a Sun4, so the monitor commands are completely different
>from anything manufactured in the last ten years....
Thanks!
--jmg
Recently there were a number of VAXservers offered from VCC.
The disposition is they are gone. Some comments for those that are
curious.
They were VAXservers (KA410e) meaning they do not have the graphic console
and they are old and as 3100s go slow. Compared to a m30, m38, m80 series
these are the slowest models. So if you not familiar with VAXen...they
were designed and intended as cheap servers.
Each one weights about 20-25 pounds basic weight of the 3100 pizza box
regardless of model. I priced packaging and shipping in the USA
as $30-50 each (even the tape drives weigh alot!). Thy may be small but
they weigh a lot. That's a lot of money. I can't deal with it. So I'm
not into shipping them. Many people wanted one shipped from VCC and none
took into account that the source had a job to do and no time or resources
to pack them and send them to indiviuals for free and there was no way to
recover the cost back. Me I'm broke so I can't lay out cash to ship them.
Take this as a hint when trying to procure systems/pieces. The source
generally desires LOW EFFORT/COST meaning you pick it up.
Allison
>The infamous Japanese PCjr? The JX was the last straw for the jr community.
>When we heard about it we though IBM was fixing to revive the jr--little
>did we know. Is there any chance you could post a couple snapshots of the
>JX somewhere? I'd love to have a look at one so I can cry in my beer.
I opened one of them up to check her out, and have a shot of the system
with the cover off. As soonas I get the film proceesed I'll put them up.
An ugly beast though - I like them, but they are an ugly dark gray.
>IIRC, the JX could boot PC-DOS 2.10. If it's inwards are anything like the
>PCjr, it's a 128K box, so unless it has been expanded, you're probably
>stuck with DOS 2.10 or 3.x.
It seems they were 512k as standard, but there was no seperate video ram
so 64k of that was taken.
thanks heaps,
Adam.
