The serial port is to link it to some software on the PC I think, more info on the Uni-Trend Website. It's not a feature I would find a use for, although it may have some cool factor One of my testers at work links to software on the laptop via bluetooth, doesn't do anything extra (just shows results on the laptop screen) but it's kinda cool.

I once heard of a chap washing PCB's in his washing up bowl, and then blasting them dry with compressed air. We have loads of compressed air in the garage were the pinball is at the moment, the boards are 11 years old now, do you think this will do more damage than good?

Cheers

Cris.