New Olimex AVR-P40 questions

I just bought an AVR-P40 and apparently it is a little bit newer than the current documentation and schematics on line. The board does not list a revision, but it does say Copyright 2005.

It has a “general purpose button” - what port is this wired to?

It also has a jumper labelled “3.3V” which is defaulted to not connected. What is this for? Is it related to the old docs which say there are two jumpers for AVCC/AGND?

Any help (or pointers to new docs/schematics) would be greatly appreciated.

I think I answered my own question. The schematics for the USB version of the board show a button on PB4. The 3.3V jumper changes the voltage regulator adjustment to (I assume) output 3.3V.