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

[Peter Bell]

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.