I have look at the output from my timer with a "Oscilloskop" (I have no english word for that).
If someones is interested I can mail that I know. It is not much and you can probably not make anything with it now but I´m going to make some more tests when i have a litle more time.
uhhh... with just a *little* bit of electrical engineering knowledge, you can easily make a functioning cable with a 2.5mm plug on one side, and a male parallel port on the other. (You can make a serial one too, but it's a bit tougher).
The signal is to weak, you must probably strengthen it befor a computer can read it. (still just a *little* bit of electrical engineering knowledge to make a cable)