I've already posted this to the PS/2 newsgroup but thought I'd drop it in here
too just in case - I believe the machine in question is old enough (or odd
enough) to qualify.
Basically I'm in the process of restoring a Model 50 I was given recently and
was wondering if anyone could point me at a technical reference guide for the
machine?
I also have a couple of questions.
1) The machine contains what I assume to be the hard disc controller, what
capacity/type of drives will the machine accept - and where can I get one?
2) Can the machine accept 2.88Mb drives (this one is purely out of interest)?
3) There is an expansion card with no markings on installed in the slot
farthest away from the PSU. It is connected to what appears to be the
processor socket ('286 right?) by a section of flexible PCB.
The card has a daughter board attached which is about half as long as the
card. The visible part of the main PCB contains three (empty) 72-pin SIMM
sockets.
Any ideas on what this may be (some sort of turbo board, 386SX upgrade, etc)?
Was it fitted as standard or was it added later?
4) The "paddle" on the power switch has been broken off. Can I get a
replacement switch or do I need to get a new PSU?
Thanks.
TTFN - Pete.
--
Hardware & Software Engineer. Sound Engineer.
Collector of Arcade Machines, Games Consoles & Obsolete Computers (esp DEC)
peter.pachla(a)wintermute.org.uk |
peter.pachla(a)vectrex.freeserve.co.uk |
peter.pachla(a)virgin.net |
peter.pachla(a)wintermute.free-online.co.uk | www.wintermute.free-online.co.uk
--
I have one of these PS2/M50Z. Nice boxen!
There wer two versions the M50 and the M50Z. The latter was the faster 286
of the two.
<1) The machine contains what I assume to be the hard disc controller, what
<capacity/type of drives will the machine accept - and where can I get one?
The two standard controllers were 20mb or 60mb but there were later ones to
I think 120mb.
<2) Can the machine accept 2.88Mb drives (this one is purely out of interest
Not that I know of.
<3) There is an expansion card with no markings on installed in the slot
<farthest away from the PSU. It is connected to what appears to be the
<processor socket ('286 right?) by a section of flexible PCB.
Likely a memory expansion.
<4) The "paddle" on the power switch has been broken off. Can I get a
<replacement switch or do I need to get a new PSU?
best source is a PS/2 wreck (most any of the older models.). there is
a web site that has PS/2 info. Can't seem to find it right now.
Allison
>>One idea that has crossed my mind, but I don't know if there's any way
>>to pull it off: There are obviously lots of "collectors" on E-bay who have
>Between newsgroups and this list you have informed a number of people who
>tend to blab, so lots more get key information.
True, but for every well-connected classic computer user (and I rank
all subscribers to classiccmp as "well-connected"!) I'm willing
to bet there are 1000 others who don't have a clue as to what free resources
there are on the web for their old platform, be it a PDP-11 or a
CP/M machine or a IBM 1401 :-).
>Ebay is simple, put some up for auction. Its an AD.
I'm more concerned with hooking up users with all the free software
archives that are already out there, than with selling any particular item.
Even many of our "collector" pages, where folks put up pictures of their
favorite old computers, often do a very poor job of connecting random readers
to useful resources.
Am I completely misguided in wanting to reach more people - in particular,
folks we haven't already reached - so that they can more effectively use
their classic computers? Many of our efforts on this list
are confined to the small circle of those who are already "in the know".
--
Tim Shoppa Email: shoppa(a)trailing-edge.com
Trailing Edge Technology WWW: http://www.trailing-edge.com/
7328 Bradley Blvd Voice: 301-767-5917
Bethesda, MD, USA 20817 Fax: 301-767-5927
<One thing that I myself forget at eBay is that you can state a maximum bid
<and the machine will automagically bid for you in the stated increments
<until the auction either ends or your maximum bid limit is reached.
Ick, my machine can out bid you machine. Ah, shades of the 87 stockmarket.
I think I stay away from online auctions for another few years.
Allison
On Sun, 17 Oct 1999 10:44:55 -0700 "Mark" <markiw(a)prodigy.net> writes:
>>About a week ago I put a bid on a Micro PDP-11/23 on ebay. I was top
>>bidder until the end.
>
>Don't you hate it when that happens?
>
>One thing that I myself forget at eBay is that you can state a maximum
>bid and the machine will automagically bid for you in the stated
>increments
>until the auction either ends or your maximum bid limit is reached.
>
>I am writing this on a computer I got there last year at about half
>the going price that way. As eBay has gotten popular it is getting
harder
>to just watch the auctions and bid yourself. In fact, I no longer shop
>there anymore as I think the prices have gone postal.
Well, despite your astute observation, there *are* some bargains
to be had. I just got an NOS 8" FDD for <$4. YOu just have to know
which items are likely to go 'postal' and stay away. . .
Jeff
___________________________________________________________________
Get the Internet just the way you want it.
Free software, free e-mail, and free Internet access for a month!
Try Juno Web: http://dl.www.juno.com/dynoget/tagj.
Now see guys? That's the kinda pricing *I* like to see!
(It's the only kind I can afford . . . .)
Jeff
>Let me add a data point, lest Randy or others be left with the idea
>that ebay prices are universal. Last month I bought an 11/73 for $5; the
>zeros came *after* the decimal point.
>
>--
>Kevin
>schoedel(a)kw.igs.net
___________________________________________________________________
Get the Internet just the way you want it.
Free software, free e-mail, and free Internet access for a month!
Try Juno Web: http://dl.www.juno.com/dynoget/tagj.
-----Original Message-----
From: schoedel(a)kw.igs.net <schoedel(a)kw.igs.net>
To: Discussion re-collecting of classic computers
<classiccmp(a)u.washington.edu>
Date: Sunday, October 17, 1999 12:54 PM
Subject: Re: Outbid
>>Randy, I have another 11/73 loaded I was going to put up on EBay , you can
>>have it for $300. It has a tape drive, RD52, memory, 8 line serial port,
>>runs, its missing one switch on the front and the bottom of the stand is
>>cracked.. other than that it runs micro rsx - happy machine. I think I
might
>>be able to dig up an RX50 for it as well.
>
>Let me add a data point, lest Randy or others be left with the idea that
>ebay prices are universal. Last month I bought an 11/73 for $5; the zeros
>came *after* the decimal point.
and I am picking up:
2 Honeywell 316 systems with 4 (I repeat) 4 - PDP 11/05s with 2 RK05 on
each) - FOR FREE!
Either:
1- Straight 8 with full docs or 1- IBM 360 for $200.
I don't think I'll sell any of them for less than $1000.
Just because we get something for $5 or free does not mean they are *worth*
that. (and I'm not even talking EBay dollars!)
john
>
>--
>Kevin
>schoedel(a)kw.igs.net
>
Another thing I've had lying about for a number of years is an apple II-C. Is there anything one can do with this thing hardware-wise to use it for some for of fairly complete I/O processing? If I pry it open, will I find anything there to which I could attach a cable and bring out, say, sufficient signals, etc, to drive a PIA or some such?
Is there a bit of free software one can use to develop code for this thing? I'd like to fiddle with it if it allows putzing with I/O, since I'm always trying to stimulate/monitor SOMETHING to see how/whether it works. A simple box like the II-C might be just the thing.
Any suggestions?
Dick
Randy, I have another 11/73 loaded I was going to put up on EBay , you can
have it for $300. It has a tape drive, RD52, memory, 8 line serial port,
runs, its missing one switch on the front and the bottom of the stand is
cracked.. other than that it runs micro rsx - happy machine. I think I might
be able to dig up an RX50 for it as well.
If you want it or anyone else please email me.
-----Original Message-----
From: Randy Kaplan <rkaplan(a)accsys-corp.com>
To: Discussion re-collecting of classic computers
<classiccmp(a)u.washington.edu>
Date: Sunday, October 17, 1999 10:47 AM
Subject: Outbid
>Hello all -
>
>About a week ago I put a bid on a Micro PDP-11/23 on ebay. I was top
>bidder until the end. Of course the end was when I was asleep (3 AM)
>this morning (serves me right for sleeping). Got up and was very
>disappointed. Since the recent discussion about collectors vs.
>enthusiasts I thought I would share this with the group. As a new
>collector, I have been reading alot about sources and establishing
>networks but they are not in place yet so one of my main venues is ebay
>at this time. I plan to start contacting scrappers, universities, and
>friends in companies soon. But, alas, today a PDP-11/23 flew by.
>
>Randy Kaplan
>
--- daniel <daniel(a)internet.look.ca> wrote:
> >> One of the other interesting items are a M7260/M7261 pair...
> Actually the 11/05 and the 11/10 have two different backplanes (as I have
> both) and the cards are fitted differently in each one. Keep your H214
> memory and G231/G110 core drivers.. The 11/05 uses that for it's own memory.
> The older 11/05 backplane did not use +15V either!
Given where this stuff came from (there's an inventory sticker glued to the
back of one of the CPU boards of the company I rescued it from), that all
makes sense.
> Which CPU boards do you have. It's easy to tell. Does one of them have a
> rotary switch to set the baud rate?
It's not in front of me, but I do rememeber spotting one of those button
rotaries on there and wondering what it was for. I recovnize it as usually
being for baud rate, but I was guessing it was some kind of timing adjustment.
> To get an 11/05 running you need:
To jump in out of turn, IIRC, this particular unit also came to me with
an RX11 controller.
> M7260
> M7261
Check.
> G231 X 2
> G110 X 2
> H214 X2
Well... I've only got 16K
> G727 (grant)
I have crates of those, including several "Grantasaurous Rex" cards, the
original third-party double grant card (NPR plus the other three). I should
scan one. For those that haven't seen them, they have no colored handle, but
the PCB is but into a soft-edged T-handle with a dinosaur silkscreened in
red on the "component" side. Somewhere, I still have the original artwork.
Software Results Corp made and shipped one with every COMBOARD(R)
> You don't need a console serial board (M7800) as that was built into the CPU
> board.
I didn't know that. I take it that it uses the standard DL11 cable?
> You can tell the year of the PDP 11/05 CPU set by:
>
> 74 - if the back of the boards are green (solder masked)
Bingo.
> I have restored many PDP 11/05s for "collectors" - yes, at $875 a pop!
Stunning.
> I have about 5-6 cpu sets, 1 is beta.
Interesting.
> >> Finally, we come to an RK11D board set... M7254 through M7257.
> I have two sets of these and run 8 RK05s, again, restored many of these. You
> need a RK11-D backplane.
I'm not sure I have one of those.
> You can hand wire one (yes I know many who have for UNIBUS operation
I can probably come up with the goodies to do that. I have the remnants
of a PDP-8/L that came as parts with the first one I got... the chassis was
broken (mounting bar in the front), the front panel scavenged, no core and
obviously broken wires on the backplane. I wish I hadn't now, but I did
remove the remaining wires from the backplane (one at a time, documenting
them because it was the only way at the time to try and understand how the
other one worked). The end result is that I have a set of DEC backplane
blocks I could wire into a different configuration. I recycled the stamped
metal bus strips on a couple segments into the upper address bits on a BA11N
way back. DEC used to sell that stuff by the foot. I'd love to get a spool
of it (Ha!)
> The best backplane I have is from someone who completely modified a PDP
> 11/05 (16K backplane).He took out the second core memory set and completely
> hand wired the RK11-D on it. Yikes. It works and I still have the plane if
> you are interested in the wire list to do that.
Wow. Much work. I'll get back to you if I can't find an RK11D backplane.
> The PDP 11/05 needs AClow, DClow,5V, -15V.
>
> The newer ones required +15V.
Muchas Gracias.
-ethan
=====
Infinet has been sold. The domain is going away in February.
Please send all replies to
erd(a)iname.com
__________________________________________________
Do You Yahoo!?
Bid and sell for free at http://auctions.yahoo.com
