Thanks to the couple of guys emailing me about this I have measured a
few more things
after Tony Duell's advice as follows.
The three test points on the board are as follows with the machine off
labelled Vp 4.8V
+5 0V
Vc 2.86V
The transisitor Q8 has 4.8 V on the emitter but 0.18 Von the collector
the +ve side of Capacitor C11 is 2.86 V
pin 15 on IC7 is high
None of these values change when the machine is switched on.
As an aside, for those who maybe wondering why I'm bothering - I work at
>from Exeter university
medical physics department and I have been
asked by one of our research groups to help them with a problem
regarding a pair of Epson HX-20's
(from about 1983). This group still use this machine to control a piece
of equipment which is used as
part of a large clinical study in diabetes and there is currently no
available replacement.
We are in the process of replacing these computers with newer machines
(for which we need to
replicate and validate that the software performs identically as before
which will take some time)
but we would like if possible to keep them running in the meantime.
If any one would be willing to supply photocopies of the relevant bits
of the manual (schematic in
particular) I would of course pay towards copying/postage/time.
Yours
Matthew Clemence
Now that I have a good machine to try installing OS/2 on (a PS/2 Model
95), it seems that the install disks for my copy of OS/2 Warp 3 have
become re-magnitized in a patter to obscure the original data. Does
anyone have a copy of OS/2 that they can send me (Teledisk images or dd
images or an ISO is just fine with me) or know if I can talk to someone at
IBM to get new media to replace the failed old media?
Thanks for the help!
Pat
--
"The Microsoft/IBM FORTRAN was adequate for teaching FORTRAN 77. But the
performance was AMAZING! It could actually take longer to run a benchmark
like sieve of Erastothanes with compiled FORTRAN than with interpreted
BASIC."
-- Fred Cisin (XenoSoft)
http://dilbert.com/comics/dilbert/archive/images/dilbert2040637020924.gif
>From: "Zane H. Healy" <healyzh(a)aracnet.com>
>
>> Just out of curiousity, how many other people here name their classic
>> computers (for reasons other than giving them a network address)
>>
>> -tony
>
>Personally the only computers I give names to are ones on my network (of
>course basically every system I have setup is networked). I've reached the
>point though where the name is likely to simply reflect what kind of hardware
>the host is. Other times the name might be what it was prior to my getting
>it.
>
> Zane
>
Hi
I have one at work I call "Piece of Sh*t".
Does that count as naming?
Dwight
I found your great web site. Would you please give me some advice? My A4000 with a Cyberscsi I module does not always boot from the floppy or the hard drive (let alone from external hard drives). I'm certain I've got proper end termination and a good cable. When it does not boot from either the hard drive or the floppy it does not even check in with the floppy as it should. I was wondering if you knew the proper voltages on the hard drive power connector. Mine gave 5.0 volt and 11.77 volt. But my A200 give 5.0 and 11.23 (it also boots intermittantly). Also, whether a low density floppy would work in place of the high density it comes with. I have a spare low density in case it is the floppy which is intermittant. THanks for any comments. I bought all these and am having nightmares
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Reminds me of a couple of AT&T 6300's that I used in an exhibit at the Field
Museum of Natural History here in Chicago. The keyboards were mounded under
1/2 inch particle board, with just the keypads showing (to run the program).
We needed to add an extra instructional label beside the keypad, so the
exhibit preparators screened the labels and, to protect them, mounted thin
plexiglas over them. To mount the plexi, they drilled 4 holes all the way
through the particle board -- and the keyboards that were underneath.
Amazingly, neither of the keyboards was destroyed.
Bob
-----Original Message-----
From: ard(a)p850ug1.demon.co.uk [mailto:ard@p850ug1.demon.co.uk]
Sent: Wednesday, October 23, 2002 4:21 PM
To: cctalk(a)classiccmp.org
Subject: Re: Tandy XENIX Disks
<snip>
There is one other nasty fault I've seen (at least on the M3, and I
suspect the M4 is identical). There's a plastic post moulded into the
bottom case of the machine under the keyboard. If something heavy is
dropped onto the keyboard, it will cause this post to hit the PCB with
enough force to break tracks.
While you have the keyboard apart, examine this area of the PCB very
carefully.
> had that problems with M3 and M4 KB's
-tony
I wrote:
> The SCSI connector, however, is NOT usable for what you're doing.
> The BA440 box (which is what your cab sounds like) has provisions
> for changing its internal (DSSI) bus into a SCSI bus, for example
> to be used with the KFQSA controller. That way, you can use SCSI
> devices with the VAX by mounting them in the old DSSI rails.
>
> The VAX does _NOT_ have a SCSI controller by default; unless you
> have something like a KFQSA, Dilog or Emulex SCSI-to-Qbus controller,
> you can NOT use the RRD43.
Make that an KZQSA, obviously...
Does anyone have a KFQSA and/or KZQSA they'd be willing to let go
for a fair price?
Thanks,
Fred
I like what my computer is named (work): VAX11785.. my dad's computer
formerly was VAX11780, but that was 2 machines ago.. and now his is faster :
(
Will J
_________________________________________________________________
Unlimited Internet access -- and 2 months free! Try MSN.
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In regard to the Freeware CDs for RSX-11 and RT-11
I have now finished the verification tasks that I feel
are needed to ensure that I am producing correct images.
I have made some copies of the CD images from:
ftp://ftp.trailing-edge.com/pub/cd-images/http://www.classiccmp.org/PDP-11/RT-11/http://www.classiccmp.org/PDP-11/RSX-11/
They will shortly be sent to those individuals who
requested them.
Since there might be a number of individuals who can't
download at a reasonable speed (even with DSL it takes
about 3 hours each at about 30 KBytes per second as
compared with about 3 KBytes per second on a dial up line),
I am prepared to make additional copies (Tim Shoppa
no longer seems to have the time to do so) and make
them available at my cost (for media, label, envelope
and shipping carton plus postage to the US) and make
them available at my cost of about $ 5 / $ 8 / $ 10 for
1 / 2 / 3 CDs. If you prefer to have me use Maxell
Black brand CDs which I have been told last about
twice as long, the cost will be $ 1 more per CD. Note
that all the prices are in US dollars for destinations in
the US and postage from Canada. If you are in a
different country, the postage will be different. Also
note that any funds that I receive will be regarded as
a gift.
Sincerely yours,
Jerome Fine
--
If you attempted to send a reply and the original e-mail
address has been discontinued due a high volume of junk
e-mail, then the semi-permanent e-mail address can be
obtained by replacing the four characters preceding the
'at' with the four digits of the current year.
Hi,
We have a TLZ-06AA 4mm DAT drive on our DEC 3000-500 Alpha server and
there is some problem with it. Can someone tell me if there is an
equivalent drive for the same?
Thanks.
Rajagopalan
Bill,
Do you still have these PI's, if so what is the spec 4D/20 12 or 20Mhz, or
4D/30, 4D35.
Any info would help, if gone thanks anyway
Thanks & regards
David Frith
SGD Systems Ltd
T: +44 1235 227322
F: +44 1235 766065
Email: sales(a)sgdp.co.uk
Web: www.sgdp.co.uk
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