Quote:
Originally Posted by SiriusHardware
One further point, some very old PROM devices may draw quite a bit of current from the +5V supply pin on the GPIO port. The best Pi models to use in this respect are the Pi Zero and Pi 4, as the +5V input from the PSU is passed unfused to the +5V GPIO pin on those models. The available current is then only really limited by the ability of the PSU to supply it, in addition to the supply current needed by the Pi itself of course.
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Thanks for all the info. I might be tempted to knock one up some time, to have a play with it as should have everything required.
And I may well try it with an RPi Zero I've got, as only have one RPi4, I recently got to go into a PiTop Laptop case (besides some old original RPi-1's, with only a 26-way GPIO connector, although I think I may have an RPi2 somewhere as well).
I might even try building a direct plug-in one for some specific odd pinout ROMs etc, on a bit of matrix-squares / veroboard, rather than having to work out all the patching required each time.