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

[comsec22]

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 at lists.febo.com>
ha scritto:

> On Mon, Sep 19, 2022 at 10:31 AM John via time-nuts <
> time-nuts at 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.
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