[time-nuts] Frequency Counter Choice

[Andy Talbot]

In days of yore + DOS, I implemented a GPIB control by bit-banging a
parallel printer port.
Those were the days

Andy
www.g4jnt.com



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On Thu, 22 Oct 2020 at 17:59, jimlux <jimlux at earthlink.net> wrote:

> On 10/22/20 8:29 AM, Tom Van Baak wrote:
>
> >
> > 3) Instead of replacing the front panel readout, instead do all your
> > comms over SCPI, to the point where you have created a virtual
> > instrument, not unlike some of the logic analyzer or 'scope PC apps.
> > This solution would be very welcome by lots time-nuts. It means we could
> > fully operate our 53131/53132 counters with the VFD disabled. The
> > downsize is that it requires a GPIB (Prologix) adapter.
> >
> > /tvb
> >
> >
> While I love my Prologix adapters, I wonder if one could implement the
> protocol using GPIO pins on something like a Beagleboard or Arduino clone?
>
> (yes, as a product, with the right connector and line driver/receivers,
> etc. - it would cost the same as a Prologix... but as a hack...)
>
> After all GPIB is a very old standard, and was developed back in the day
> of 1 MHz logic. I think you could do the handshaking in software - punch
> the bits one by one, assert DAV, etc.
> Listener reads bits one by one, then asserts the ACK or NAK
>
>
>
> (Aieee.. Wikipedia says it was supported by the Commodore PET... there's
> a challenge for you)
>
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