Hey, I 've learned already much from the other questions.
But I can't find the technical data for making a MIDI cable to my computer from my groovebox by using the joystick 15 pins port.
I already have found a "bad gateway" link to a side with those very usefull information.
These interfaces basically consist of an opto-coupler and a couple resistors. Do a Google on "midi interface" and you'll come up with a kazillion results -- including this one (http://www.harmony-central.com/MIDI/sbmidi.txt).
Thank you very much, I wil try to work it out and wil give some feedback when used. Thanks