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 <http://www.avg.com/email-signature?utm_medium=email&utm_source=link&utm_campaign=sig-email&utm_content=webmail> Virus-free. www.avg.com <http://www.avg.com/email-signature?utm_medium=email&utm_source=link&utm_campaign=sig-email&utm_content=webmail> <#DAB4FAD8-2DD7-40BB-A1B8-4E2AA1F9FDF2> On Thu, 22 Oct 2020 at 17:59, jimlux <jim...@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) > > _______________________________________________ > time-nuts mailing list -- time-nuts@lists.febo.com > To unsubscribe, go to > http://lists.febo.com/mailman/listinfo/time-nuts_lists.febo.com > and follow the instructions there. > _______________________________________________ time-nuts mailing list -- time-nuts@lists.febo.com To unsubscribe, go to http://lists.febo.com/mailman/listinfo/time-nuts_lists.febo.com and follow the instructions there.