In the article it says that the A2000 get a "clock"-pulse from the PSU, wich is from pin 14.
It also says that by changing jumper 300 this pulse is no longer needed, and therefore the pin 14 isn't needed anymore either.....
hope that made sense...

EDIT:
(it also says that they don't take responisbility of any damages caused by this hack...

), but then again I guess you knew that...
