Hi David,
That certainly is a shame. For the gold plated contact to corrode so badly
means large amounts of potential damage to the flexible PCB.
You may be able to repair it using some brass shim - but I cant see how
else to repair it.
The CX was a wonderful machine - and seeing this has remin
Hi everybody
I'm the proud owner of a PDP11/05 system with a couple of 8" floppy
drives. I believe they are likely to be RX01s.
Does anybody on the list have some boot media that they could provide. I
understand that the controller can't format the disks so I'm in a
frustrating state where I do
Using an older version OS and PDPGUI send a tape image into RAM through the
serial port. Helps if you have a m9312 ROM board. You can make rx01 disks
using dunfield's disk utility (right?) I believe but I never actually did
this myself.
Bill
On Tue, Apr 21, 2020, 5:35 AM Doug Jackson via cctalk
On 4/21/20 5:02 AM, Bill Degnan via cctalk wrote:
> Using an older version OS and PDPGUI send a tape image into RAM through the
> serial port. Helps if you have a m9312 ROM board. You can make rx01 disks
> using dunfield's disk utility (right?) I believe but I never actually did
Yes, that's assu
Or someone could lend you some floppies. I have an RX02 drive here I am
putting back together, right now I have it switched to emulate an RX01
with my RXV11 controller. I'll look through my floppies and see if I
have some RX01 disks I can load up with RT11.
C
On 4/21/2020 10:15 AM, Chuck Guzi
Well I'm starting to walk through this. First I took an IR picture of
the boards in operation, then started troubleshooting.
First I started checking voltages. J2 is easily accessible so I put a
ground probe on pin 10, and checked voltages as follows:
J2-3 Should be -5v, reading -3.8v
J2-2 Sh
I'm very fond of my hp41c and still use it every day. When I had a minor
problem with it, I sent it here and they did a fantastic job for what I
considered a very reasonable price:
https://vintagecalculatorrepair.com/
If you want to DIY and your issues are solely the battery compartment, see:
On 2020-Apr-21, at 7:57 AM, Chris Zach via cctalk wrote:
> Well I'm starting to walk through this. First I took an IR picture of the
> boards in operation, then started troubleshooting.
>
> First I started checking voltages. J2 is easily accessible so I put a ground
> probe on pin 10, and checke
The raster seems folded at the left and at the top, which indicates a
problem with both the vertical and horizontal sweep.
As Mattis Lind already mentioned, the VT52 uses direct drive of the
vertical and horizontal circuitry (no oscillators to synchronize) yet
the character rows in the video a
6800 manuals?
I think I have all the wanted manuals physical + a lot more on the boards..
Also a lot of the boards + an Exorciser 1 setup with CRT interface
Got a couple of ADDS Viewpoint terminals if somebody should be interested
It's a last call situation as I am creatin space for newer thin
> Date: Sun, 19 Apr 2020 15:29:44 -0400
> From: Chris Zach
> To: CCTalk mailing list
> Subject: pdp11/84 PMI memory: What is the problem with Q bus?
> Message-ID: <3efa4105-3d3d-bb98-0358-8c46fca0f...@alembic.crystel.com>
> Content-Type: text/plain; charset=utf-8; format=flowed
>
> So I picked
>
> Date: Sun, 19 Apr 2020 15:29:44 -0400
> From: Chris Zach
> To: CCTalk mailing list
> Subject: pdp11/84 PMI memory: What is the problem with Q bus?
> Message-ID: <3efa4105-3d3d-bb98-0358-8c46fca0f...@alembic.crystel.com>
> Content-Type: text/plain; charset=utf-8; format=flowed
>
> So I picke
It's conceivable there was a revision change where the -12V was changed to
-15V, but it does seem unlikely.
The -12 is used by the vertical deflection circuit, the CRT filament, (and the
RS-232).
Well, vertical deflection seems to be my problem so this may make sense.
Until I figure this out
On Tue, Apr 21, 2020 at 4:32 PM Chuck Guzis via cctalk
wrote:
>
> Yes, that's assuming you have a PC with an FDC capable of
> writing/formatting FM floppies.
>
> --Chuck
Since nobody has mentioned it in this thread already Dave Dunfield's
TestFDC is good for finding out if the FDC in a PC is capa
Thanks Mark! Actually this was just the boards from the 11/84 (no idea
what happened to the chassis, drat) so it's an 11/84 CPU (18mhz, FPP
chip installed), 2 PMI boards (one old 2mb, one new 1mb) a console board
of some sort and the Unibus map.
I popped this into my BA23 to speed things up a
Ok, some test results below.
1) Are we sure J2-2 should be -12? It really seems to like being -15.
2) The voltage across the zener diode there is a nice solid -3.8-3.9v.
It appears to be a germanium diode (.1v drop across, both directions) I
could disconnect it and see if that makes things bett
I wonder if I would go straight to hell if I just pulled the Q12
transistor and wired in a 12 volt wall wart between ground (J2-2) and
+12 (ground) to get -12
C
On 4/21/2020 5:36 PM, Chris Zach via cctalk wrote:
Ok, some test results below.
1) Are we sure J2-2 should be -12? It really se
> Hi everybody
>
> I'm the proud owner of a PDP11/05 system with a couple of 8" floppy
drives. I believe they are likely to be RX01s.
>
> Does anybody on the list have some boot media that they could provide. I
understand that the controller can't format
> the disks so I'm in a frustrating
You should also ask on the vcf forum. There are a number of 6800 people there.
Dwight
From: cctalk on behalf of David Christiansen
via cctalk
Sent: Tuesday, April 21, 2020 9:30 AM
To: cctalk@classiccmp.org
Subject: Re: Motorola EXORciser M6800 System
6800 manu
The System Source Computer Museum is closed due to COVID-19, so we are making
some video gallery talks.
Here is the first one:
https://www.youtube.com/watch?v=hq7aVCc2GP8
The video describes some of the applications of this 57 year old computer
including it original use at Goddard Space Flig
Hi Mark,
I haven't looked a the Classic Computer List in a couple of months so
please forgive this late post. I would be interested in the box and
contents. I collect Palm Pilots and have one to put in the box.
If it is still available I could send you my address. I would be happy to
pay postage.
Meantime reading the manual I found an interesting test: If you short
emitter to base on Q4 (easiest way is to jumper diode D10) the voltage
on the -12v supply goes to .4 volts. They're saying it's E2, R15,R17,R14.
Is there a way I can test the op-amp in circuit? Maybe it's dead.
C
On 4/21/2
On 2020-Apr-21, at 5:27 PM, Chris Zach via cctalk wrote:
> Meantime reading the manual I found an interesting test: If you short emitter
> to base on Q4 (easiest way is to jumper diode D10) the voltage on the -12v
> supply goes to .4 volts. They're saying it's E2, R15,R17,R14.
>
> Is there a way
The D8 5V ref and the targetted output V are divided via R15 and R17,R18 to
provide the sense input at E2.2.
If one does the R ratio of the three resistors, it comes out, as would be
expected, to ~ 0V.
Ah hah, that is clever. I wonder if the .8 volts means the output is
higher than what shoul
On 2020-Apr-21, at 8:35 PM, Chris Zach wrote:
>> The D8 5V ref and the targetted output V are divided via R15 and R17,R18 to
>> provide the sense input at E2.2.
>> If one does the R ratio of the three resistors, it comes out, as would be
>> expected, to ~ 0V.
>
> Ah hah, that is clever. I wonder
Hi David,
do you have Micromodule Manuals for the 6800 and 6809 single boards?
Cheers Thomas
Am 21.04.2020 um 17:30 schrieb David Christiansen via cctalk:
6800 manuals?
I think I have all the wanted manuals physical + a lot more on the
boards..
Also a lot of the boards + an Exorciser 1 set
I found the referenced paper, wrong authors - it was Bell and
Casasent, in a cache paper, a bit earlier than 78
On Thu, Apr 16, 2020 at 9:17 PM Bob Smith wrote:
>
> Nice!
> BUT no my BigMac is a Mac Pro 1,1 tweaked with TB of disk with my old
> files on it.
> I call it BigMac cause it is about t
Is it possible to share the link.
On Wed, 22 Apr. 2020, 3:38 pm Bob Smith via cctalk,
wrote:
> I found the referenced paper, wrong authors - it was Bell and
> Casasent, in a cache paper, a bit earlier than 78
>
> On Thu, Apr 16, 2020 at 9:17 PM Bob Smith wrote:
> >
> > Nice!
> > BUT no my BigM
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