Hi Everyone!
I have looked at the pinout required to use the Olimex AVR JTAG tool and I also have looked at their target connector reference (given in the AVR-M16 schematic). And there is only one question left:
Why is PB0 connected to JTAG pin 8 in the M-16 reference design?
What does it do and is it really needed?
(Actually that are two questions… 
Any input on this is higly appreciated!
Best
Alex