Okay. The serial numbers are:
The big square one:
TYPE 103H7522-8221
LOT NO 01720
AX060124
The round one:
TYPE 103H7126-0413
AX060117B
I found a little info on the square one, but not much. No wireing but i found that it must be a unipolar 2-phase model.
The round one I haven't found any info on yet.
If anyone can help it will be greatly appriciated..
I thought about building something similar to:
http://pminmo.com/discrete/discrete.htm
which uses discrete components rather than chips. I also thought about using the L297+L298N combo. But im not sure that will run a unipolar stepper.
Regards
Martin