[time-nuts] Re: TRAK Systems 8812 (marco bartoli)

[marco bartoli]

Gerard, Did You use the TMS9914A on Your Trak ?
________________________________
From: ghf at hoffmann-hochfrequenz.de <ghf at hoffmann-hochfrequenz.de>
Sent: 21 September 2022 1:25 PM
To: Discussion of precise time and frequency measurement <time-nuts at lists.febo.com>
Cc: marco bartoli <marcobartoli64 at 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