Terry, I recently bought a logic probe and was testing the U14 chip on the WPC MPU board. I was hooked up to 5 volts and was testing the bottom legs of the chip. I was able to confirm the chip was bad, but seconds later i think i shorted between 2 legs of the ic chip. this caused the game to reset. Since the chip was already bad, I couldn't tell if this made things worse.

I was able to replace the chip with a socket and a new chip, and all is fine now with my game (BSD), but doing that really intimidated me. I came to learn that these tiny legs on ic chips are hard to test in the back box. I have a pretty steady hand, but those suckers have got to be about a millimeter apart.

My question - is that really bad to short the probe between 2 legs? Will it cause damage? Or is 5 v too little to fry anything.

For the future, I am going to try to set up a bench tester with computer power supply.