Over the years, the Raspberry Pi has gone through a number of power supply protection iterations - however one thing there is that they're almost disposable, unlike our one-off and old chip designs here, so I feel we need to be a bit more careful.
On the Pi, wiring up the PSU is almost impossible as the power input is USB which is almost impossible to put in the wrong way. (although I've seen otherwise). People do power the Pi via the GPIO inputs though which is no different to our 6502 case here.
The initial (Pi) strategy has been a polyfuse and reverse biased schottky diode and today they still use a polyfuse (self-resetting fuse) but they've also tried "perfect" diodes and nothing at all. If anyone is interested then (partial) schematics can be found here:
https://www.raspberrypi.org/documentati ... /README.mdPolyfuses are good, but they do drop a few mV - todays Pi PSU recommendation is for a 5.2v PSU, although there are reasons other than the on-board polyfuse for that.
Personally, I try to use polarised power connectors if possible, but constant vigilance, and all that...
-Gordon
_________________
--
Gordon Henderson.
See my
Ruby 6502 and 65816 SBC projects here:
https://projects.drogon.net/ruby/