On Sun, January 22, 2017 16:59, william degnan wrote:
> If you have time can you post the simh info, what steps you took to
> connect
> to the printer from os/8?
>
> Bill Degnan
> twitter: billdeg
> vintagecomputer.net
Hi.
I'm not familiar with OS/8, but what I do for RSX-11M is to attach a
Unix
This is the original Compaq I IBM PC clone, 8088
From: cctalk on behalf of Fred Cisin
Sent: Sunday, January 22, 2017 9:42 PM
To: General Discussion: On-Topic and Off-Topic Posts
Subject: Re: Attempt at Compaq keybord swap with a PC keyboard (failed)
On Mon, 23
On Mon, 23 Jan 2017, Randy Dawson wrote:
I have luggable with the famous Keytronics foam kepad rot.
WHAT model Compaq?
8088? 80286?
I have luggable with the famous Keytronics foam kepad rot.
I am searching for the foam (have not found it yet), and on a lark, I tried
using a PC keyboard.
In the PC keyboard, I soldered in a 7805 to take the Compaq 12V to 5V for the
PC keyboard.
Traced the clock and data lines, hooked it all
On 1/21/2017 2:46 PM, Adrian Graham wrote:
On 21/01/2017 21:08, "Chuck Guzis" wrote:
On 01/21/2017 12:43 PM, Adrian Graham wrote:
Hi folks,
Does anyone know what this is? It's obviously a transformer coil(s)
but image search and googling those markings produces nothing:
http://www.binarydin
On 01/22/2017 12:57 PM, allison wrote:
I don't know about most people but this solution has been around for
decades.
I locate the battery on the failed part with a small magnet, then grind the
epoxy down to it then pick it out with a sharp pointed tool. Once I expose
the connection point I olde
The two presentations look to be consistent to me, right down to the keyways.
The bitsavers/hack42 view is oriented is as if you held a board vertically with
the connectors edge pointing towards you and the components on your right, the
two faces are then folded out towards you.
The connectors g
> From: Eugene (W2HX)
> Before deleting this, someone ... should double check to make sure I am
> right that the file is incorrect. ... But it seems to be backward to me.
Well, it is, and it isn't. The board is drawn with the 'bottom' (in DEC
nomenclature, for when the board is insert
Before deleting this, someone much smarter than me should double check to make
sure I am right that the file is incorrect. It is a shame because it is very
nicely done. It even shows the keyways in the card. But it seems to be backward
to me.
I tried to find contact information for that hack42.
On 1/22/17 2:05 PM, W2HX wrote:
> I hope this email can be found by the next guy searching for the omnibus
> details so they can avoid wasting time.
> THIS FILE IS WRONG
> http://bitsavers.informatik.uni-stuttgart.de/pdf/dec/pdp8/pdp8e/Omnibus_legenda.pdf
>
> This file shows the Omnibus signal
I would also do a cleaning of your empty backplane with a good vacuum cleaner
nozzle. It is not uncommon for bits of conductive detritus to fall into the
backplane over time. Given that the pins are adjacent on the connector it might
be a possible cause.
Vacuuming out any stuff that has accumu
On 01/22/2017 01:49 PM, Maciej W. Rozycki wrote:
> A problem with reworking is there is sometimes very little clearance
> available, so any modification has to be made in a clever way or you
> risk a short-circuit. For example in DECstation 5000 systems their
> DS1287 chip is located in the TURB
Thanks to several who have made suggestions. Noel, Tony, Jim, and Paul thank
you. The system has been very thoroughly cleaned and the PS has been load
tested. The front panel has had some bulbs replaced as well.
I took all my boards (except the front panel) to a friend's house with a
working 8e
Yes. That remains an item on my hit list.
-Original Message-
From: cctalk [mailto:cctalk-boun...@classiccmp.org] On Behalf Of Sellam Ismail
Sent: Saturday, January 21, 2017 9:21 AM
To: cctalk@classiccmp.org
Subject: Altair
Hi Brad.
I saw your message on the ClassicCmp mailing list about
On Sun, 22 Jan 2017, Chuck Guzis wrote:
> It's worth noting that the original post was about fabricating a
> replacement using the DS12885A RTC chip. However, most old PCs used the
> DS1285 RTC (inside of a DS1287 module). The DS12885A is supposed to be
> drop-in compatible with the DS1285, but
Hi Eugene,
You might want to test the over the top connectors. I don't remember the
part #, but they do go bad. They can be labeled and swapped with a spare if
have one. Just look to see if anything has changed after every change.
Dirty contacts and bad connections are always a problem.
I would
On Sun, 22 Jan 2017, Tony Duell wrote:
> On most PCs the RTC chip is mapped as I/O ports, not memory, so you couldn't
> execute code from its RAM anyway. I suppose on (say) a 68000 based machine
> you could (there is no separate I/O port address space on that processor) but
> I have never seen it
On 1/22/2017 12:17 PM, Tony Duell wrote:
On Sun, Jan 22, 2017 at 4:27 PM, W2HX wrote:
Hi friends.
I am 100% new to my pdp8e and I am troubleshooting a problem.
The problem is that whenever address bit 7 I asserted, I also see MD bit 4
asserted.
I am hoping there is a simple short somehow be
I was hoping someone would make a M48Txx version for the old Suns etc.
Richard Sheppard
On Sun, Jan 22, 2017 at 4:27 PM, W2HX wrote:
> Hi friends.
> I am 100% new to my pdp8e and I am troubleshooting a problem.
> The problem is that whenever address bit 7 I asserted, I also see MD bit 4
> asserted.
>
> I am hoping there is a simple short somehow between these lines somewhere. I
> sh
On Sun, Jan 22, 2017 at 5:16 PM, Jon Elson wrote:
> On 01/22/2017 10:07 AM, Ali wrote:
>>
>> Al,
>> I thought the problem with switching these chips was that part of the ROM
>> code was embedded in them? I.e. it isn't just an issue of battery? Am I
>> wrong? If I am then why not use one of the rep
> Result! Whilst photographing the board to trace out that circuit (it's
> quicker for me than drawing it) I removed all the big capacitors. While they
> were out of circuit I tested them and discovered that not only was one dead
> in the -12V rail but also the through hole plating for another on t
I'm starting to pick up my KA630 emulator again. In particular, I want
to give it MSCP disk.
I have various MSCP documentation files, but they talk about MSCP
proper. None of them describe the Q-bus - nor even Unibus - port
drivers in enough detail for me to write an emulator; most of them
barel
On 01/22/2017 10:57 AM, allison wrote:
> I don't know about most people but this solution has been around for
> decades.
>
> I locate the battery on the failed part with a small magnet, then
> grind the epoxy down to it then pick it out with a sharp pointed
> tool. Once I expose the connection p
I don't know about most people but this solution has been around for
decades.
I locate the battery on the failed part with a small magnet, then grind the
epoxy down to it then pick it out with a sharp pointed tool. Once I expose
the connection point I older two wires then epoxy a small coin-cell
Jon,
Then why not use a dip compatible version of the DS chip? I mean yes this
allows for switchable battery which is very nice but SMT soldering is not for
everyone.
I wonder if there is a way to determine if there will be BIOS issues by
switching the DS12887?
Original message --
> From: Eugene (W2HX)
> I noticed that B1J (MA7) is directly adjacent to B1K (MD4). Could this
> be related?
"Rule #1: There are no concidences." :-)
> I have the board sitting on my table with the components facing up and
> the omnibus card edge is at the bottom of the card.
On 22/01/2017 07:31, "Tony Duell" wrote:
>> The -24V regulator can be seen just above the 4 blue caps, The regulator
>> that can be seen under the black wire is a 7812. The LF351N has -12V present
>> at its bias outputs, the opamp to its right has no markings helpfully.
>
> What about that IRF52
On 01/22/2017 10:07 AM, Ali wrote:
Al,
I thought the problem with switching these chips was that part of the ROM code
was embedded in them? I.e. it isn't just an issue of battery? Am I wrong? If I
am then why not use one of the replacement chips that are available?
These don't have a lot of me
Hi friends.
I am 100% new to my pdp8e and I am troubleshooting a problem.
The problem is that whenever address bit 7 I asserted, I also see MD bit 4
asserted.
I am hoping there is a simple short somehow between these lines somewhere. I
should mention that my setup has known working boards with t
Al,
I thought the problem with switching these chips was that part of the ROM code
was embedded in them? I.e. it isn't just an issue of battery? Am I wrong? If I
am then why not use one of the replacement chips that are available?
Thanks.
-Ali
Original message
From: Al Kossow
If you have time can you post the simh info, what steps you took to connect
to the printer from os/8?
Bill Degnan
twitter: billdeg
vintagecomputer.net
On Jan 22, 2017 2:25 AM, "Paul Anderson" wrote:
> Congrats!!
>
> The LA180 is probably my favorite DEC printer.
>
> On Sat, Jan 21, 2017 at 1:00
On 22/01/2017 07:31, "Tony Duell" wrote:
>>> It looks to be part of a switching regulator circuit. Possibly to generate
>>> other voltages from the 5V line. Can you post a picture of more of the PCB
>>> around it.
>>
>> Its second output goes via an IN4148 to the -24V regulator:
>
> What do you
Hey folks,
Helping my ex clean out her basement, she had a 1999 tray-loading "lime"
iMac G3 that she no longer wanted. The machine is complete w/ original
keyboard, mouse, and power cord. Boots and runs MacOS 9.2. CRT is
arcing occasionally (probably dust around the flyback?)
I'm not a Ma
34 matches
Mail list logo
