uesday, October 17, 2017 1:59:47 PM
To: Chuck Guzis; General Discussion: On-Topic and Off-Topic Posts
Subject: Re: The SPERRY UNIVAC UTS 40 system + 8406 double-sided diskette
subsystem : Restoration
Thanks for your response Chuck,
As described in the topic, just after the Power On, the machine ru
Topic Posts
Subject: Re: The SPERRY UNIVAC UTS 40 system + 8406 double-sided diskette
subsystem : Restoration
Since you know the pinout of the SIO chip, you might first look to see if where
the rx and tx pins go. This may require some hunting with an ohm meter. I'd
suspect they go to a R
From here you will likely have to begin to troubleshoot.
Dwight
From: cctalk on behalf of Dominique Carlier via
cctalk
Sent: Tuesday, October 17, 2017 1:59:47 PM
To: Chuck Guzis; General Discussion: On-Topic and Off-Topic Posts
Subject: Re: The SPERRY UNIVA
Thanks for your response Chuck,
As described in the topic, just after the Power On, the machine runs a
self-test which is called "POC TEST" on the UTS range of Sperry Univac.
During this test, the machine checks the status of the RAM, the ROMs,
the Counter Timer, and the various communication i
s.
Dwight
From: cctalk on behalf of Dominique Carlier via
cctalk
Sent: Tuesday, October 17, 2017 10:50:29 AM
To: Chuck Guzis via cctalk
Subject: Re: The SPERRY UNIVAC UTS 40 system + 8406 double-sided diskette
subsystem : Restoration
Hi Chuck,
Yes I understand well. But the fact that th
On 10/17/2017 10:50 AM, Dominique Carlier via cctalk wrote:
> Hi Chuck,
>
> Yes I understand well. But the fact that the machines Z80 based were all
> equipped with this famous serial I/O channel A and B, I therefore
> thought that the principle of verification of these channels would
> probably b
Hi Chuck,
Yes I understand well. But the fact that the machines Z80 based were all
equipped with this famous serial I/O channel A and B, I therefore
thought that the principle of verification of these channels would
probably be the same on this type of architecture (Z80+PIO+CTC+SIO).
Therefor
Hi Mattis !
I'm afraid I do not have the required skills :-/
I have never used this kind of tools. However I recovered this recently:
http://actingmachines.com/img/photos/package/europacorp/tektronix_1240_b.jpg
But in the present state of my knowledge, I could not use it. Is it
difficult fo
On 10/17/2017 04:56 AM, Dominique Carlier via cctalk wrote:
> Hi guys!
>
> Nobody here has any information to help me to solve my problem?
> Do you think I should talk about this breakdown on another forum? If
> yes, have you an address to recommend me?
>
Dominique, the probably reason that many
2017-10-17 13:56 GMT+02:00 Dominique Carlier via cctalk <
cctalk@classiccmp.org>:
> Hi guys!
>
> Nobody here has any information to help me to solve my problem?
> Do you think I should talk about this breakdown on another forum? If yes,
> have you an address to recommend me?
>
> Thanks
>
> Dominiq
Hi guys!
Nobody here has any information to help me to solve my problem?
Do you think I should talk about this breakdown on another forum? If
yes, have you an address to recommend me?
Thanks
Dominique
On 15/10/2017 23:12, Dominique Carlier via cctalk wrote:
Hi everybody,
As I have no docu
Hi everybody,
As I have no documentation / schematics I started to look for computer
schematics where it is about Z80 and “serial I/O channel B”, I found a
lot of data about this subject that I do not know at all.
These information would allow me to better target the breakdown, if any
of you w
Hi All !
I started checking / replacing all the capacitors - tantalum and
electrolytic - on the CPU board saved from the US. Until now I don't
found the guilty.
The CPU board of the USA is a horror to troubleshoot, because of the
acid the battery that changed the nature of solder tin and some
On 8/13/17, 11:15 PM, "cctech on behalf of Dominique Carlier via cctech"
wrote:
>On 12/08/2017 19:35, Al Kossow via cctalk wrote:
>> the black one in the lower left
>>
>> it is a tantalum, which are known to short, try removing them
>>
>
>Yes ! It was this one that was shorted !
>I decided in th
You're probably right, but the work is so massive, and also this time I
would like to understand and target this breakdown instead of working
(as usual) in blind mode.
In addition, I do not see the same type of capacitor on the CPU board as
the one from the subsystem you quote as being known to
Yes indeed, on the "Peripheral Interface" connector of the US
configuration there was a terminator which seems indicated that nothing
was connected there. Moreover, with the Program Cartridge US, the
terminal does not recognize the PERIPHERAL I/O board of my original
configuration.
This is why
On 10/2/2017 9:13 AM, Dominique Carlier via cctalk wrote:
Everything would be perfectly fine if most of the time I did not have
at startup an error at line 9. of the POC test:
SERIAL I / O CHANNEL B: FAILED
I doubt the US unit you bought was used with a floppy running CPM. It
most likely
Hi everybody,
Here is the next episode of the restoration of my UTS 40.
During the previous “season”, I was talking about buying a wreck of an
UTS 40 from the USA.
http://www.zeltrax.com/classiccmp_forum/annonce.jpg
I had taken the risk to buy it, after the conclusion of the sale, the
selle
On 12/08/2017 19:35, Al Kossow via cctalk wrote:
the black one in the lower left
it is a tantalum, which are known to short, try removing them
Yes ! It was this one that was shorted !
I decided in the same way to repair the second disk drive but this time
by taking some pictures.
http://ww
On 8/12/17 6:45 AM, Dominique Carlier via cctalk wrote:
> I did not know this type of case for capacitors
>
> http://www.zeltrax.com/classiccmp_forum/uts40/M2894-63_board03.jpg
the black one in the lower left
it is a tantalum, which are known to short, try removing them
It seems that you are right, I start successfully the Memorex 102 with
the PSU without flickering, this HDD uses the same voltages as the
Mitsubishi M2894-63D 8" disk drive (24VDC - 5VDC).
It remains me to find out which components are faulty
http://www.zeltrax.com/classiccmp_forum/uts40/M2894
Note that this produces the same result with either of the two disk
drive connected however your suggestion is interesting.
These two drives have the same age and some capacitors may become faulty
simultaneously. I will analyze the hypothesis, thanks!
I have an old hard drive (MEMOREX 102) with t
On 8/11/17 5:40 AM, Dominique Carlier via cctalk wrote:
> Hi all,
>
> I continued my investigations about the power supply if the 8406 subsystem.
> Here is what I observe:
>
> With the PSU in charge, I mean with a disk drive connected but without the
> +24V :
> +5V -5V +12V -12V: OK
> If I con
Hi all,
I continued my investigations about the power supply if the 8406 subsystem.
Here is what I observe:
With the PSU in charge, I mean with a disk drive connected but without
the +24V :
+5V -5V +12V -12V: OK
If I connect the +24V to the drive this is at this moment than the power
supply g
Hi everybody,
After talking about this subject but in a thread following a sale -
http://www.classiccmp.org/pipermail/cctalk/2017-July/036578.html - I
decided to start here a thread but this time fully dedicated to the
restoration of this rare computer, I named the SPERRY UNIVAC UTS 40 and
it
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