Re: TRAK Systems 8812 (marco bartoli)
My guess is that the 40 pin chip will be the special-programming
Motorola 68k-series GPIB interface processor. Not normally available,
although probably recoverable from scrapped gear. Will the programming
be identical? I don't know.
John
nuts@lists.febo.com>> wrote:
Even if I receives the six satellites correctly, apart from the week roll over issue, I never have the LOCKED led on the front panel.
So seems PLL circuit doesn't work at all.
If I try to set new value from the terminal I got ok message as response, but on the display ( DAC REF 2050 OSC CAL OK) .. I did not find any DAC, and this is the reason why the reference voltage on the rubidium didn't change
Since some ic are not in place, just the socket, I am start wondering if this are optional or not.
Attached a picture of my 8812 main board, where some ic seems.tohttp://seems.to miss.
U12, U25, U45, U46.
Can some good soul, send me a picture or tell me which ic should be in place ??
Thank You indeed
On Mon, Sep 19, 2022 at 10:31 AM John via time-nuts <
time-nuts@lists.febo.com> wrote:
My guess is that the 40 pin chip will be the special-programming
Motorola 68k-series GPIB interface processor. Not normally available,
although probably recoverable from scrapped gear. Will the programming
be identical? I don't know.
Looking at the wiring to the chips below it (which are most likely
SN75160/SN75161) I would
guess its a NEC uPD7210 - at least the data lines seem to be in about the
right place for
that part (assuming the driver chip on the left is the 75160) - they look
pretty clearly wrong for
the TMS9914A, which would be the other obvious choice for the time period
in question.
Hi Peter, the controller is 8291 the clock is on pin 3 and is coherent
withe the 8812. The other two I agree 75160 and 75161. I order the 75s..
Instead : any information on the Magnavox Gps Engine, I mean how to
program it ?
Cheers
Il Lun 19 Set 2022, 08:12 Peter Bell via time-nuts time-nuts@lists.febo.com
ha scritto:
On Mon, Sep 19, 2022 at 10:31 AM John via time-nuts <
time-nuts@lists.febo.com> wrote:
My guess is that the 40 pin chip will be the special-programming
Motorola 68k-series GPIB interface processor. Not normally available,
although probably recoverable from scrapped gear. Will the programming
be identical? I don't know.
Looking at the wiring to the chips below it (which are most likely
SN75160/SN75161) I would
guess its a NEC uPD7210 - at least the data lines seem to be in about the
right place for
that part (assuming the driver chip on the left is the 75160) - they look
pretty clearly wrong for
the TMS9914A, which would be the other obvious choice for the time period
in question.
time-nuts mailing list -- time-nuts@lists.febo.com
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GPIB implemented.
The original manual doesn't talk more about GPIB..
From: Peter Bell via time-nuts time-nuts@lists.febo.com
Sent: 19 September 2022 5:59 AM
To: Discussion of precise time and frequency measurement time-nuts@lists.febo.com
Cc: Peter Bell bell.peter@gmail.com
Subject: [time-nuts] Re: TRAK Systems 8812 (marco bartoli)
On Mon, Sep 19, 2022 at 10:31 AM John via time-nuts <
time-nuts@lists.febo.com> wrote:
My guess is that the 40 pin chip will be the special-programming
Motorola 68k-series GPIB interface processor. Not normally available,
although probably recoverable from scrapped gear. Will the programming
be identical? I don't know.
Looking at the wiring to the chips below it (which are most likely
SN75160/SN75161) I would
guess its a NEC uPD7210 - at least the data lines seem to be in about the
right place for
that part (assuming the driver chip on the left is the 75160) - they look
pretty clearly wrong for
the TMS9914A, which would be the other obvious choice for the time period
in question.
time-nuts mailing list -- time-nuts@lists.febo.com
To unsubscribe send an email to time-nuts-leave@lists.febo.com
Am 2022-09-21 11:58, schrieb marco bartoli via time-nuts:
GPIB implemented.
The original manual doesn't talk more about GPIB..
Looking at the wiring to the chips below it (which are most likely
SN75160/SN75161) I would
guess its a NEC uPD7210 - at least the data lines seem to be in about
the
right place for
that part (assuming the driver chip on the left is the 75160) - they
look
pretty clearly wrong for
the TMS9914A, which would be the other obvious choice for the time
period
in question.
Probably Intel 8291 / 8292
There is even an ebay hit
<
https://www.ebay.com/itm/P8291A-Intel-GPIB-Talk-Listen-IEEE-488-Buss-Interface-IC-Used-Board-Pull-Qty-1-/133246454941?hash=item1f061b8c9d
It is not impossible that I still have a data book, but I did choose
TMS9914A.
The 8291 could only talk/listen, the 8292 was the mating contoller,
IIRC.
regards, Gerhard
Gerard, Did You use the TMS9914A on Your Trak ?
From: ghf@hoffmann-hochfrequenz.de ghf@hoffmann-hochfrequenz.de
Sent: 21 September 2022 1:25 PM
To: Discussion of precise time and frequency measurement time-nuts@lists.febo.com
Cc: marco bartoli marcobartoli64@outlook.com
Subject: Re: [time-nuts] Re: TRAK Systems 8812 (marco bartoli)
Am 2022-09-21 11:58, schrieb marco bartoli via time-nuts:
GPIB implemented.
The original manual doesn't talk more about GPIB..
Looking at the wiring to the chips below it (which are most likely
SN75160/SN75161) I would
guess its a NEC uPD7210 - at least the data lines seem to be in about
the
right place for
that part (assuming the driver chip on the left is the 75160) - they
look
pretty clearly wrong for
the TMS9914A, which would be the other obvious choice for the time
period
in question.
Probably Intel 8291 / 8292
There is even an ebay hit
<
https://www.ebay.com/itm/P8291A-Intel-GPIB-Talk-Listen-IEEE-488-Buss-Interface-IC-Used-Board-Pull-Qty-1-/133246454941?hash=item1f061b8c9d
It is not impossible that I still have a data book, but I did choose
TMS9914A.
The 8291 could only talk/listen, the 8292 was the mating contoller,
IIRC.
regards, Gerhard