UK Vintage Radio Repair and Restoration Discussion Forum - View Single Post

SiriusHardware · 24th Feb 2021, 10:13 pm

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.

24th Feb 2021, 10:13 pm	#17
SiriusHardware Dekatron Join Date: Aug 2011 Location: Newcastle, Tyne and Wear, UK. Posts: 11,560	Re: Reading PROMs with a Raspberry Pi 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.