Hi Pawel,
the software versions of FSBus are rather few and hence there has not been any major problem with compatibility.
Believe me, if FSBus doesn´t run from the beginning it is mostly due to faulty hardware.
Especially the soldering is one of the numerous reasons. (Board´s cupper side not polished before soldering)
On top of all, due to the quite sophisticated single layer print layout the etching process is rather demanding and very often you get either short circuits or interruptions on the board as result. This applies also to some commercially available boards for FSBus.
Therefor every one should carefully check the boards (visually with a magnifyer glass and electrically with an ohm meter) prior to assembly.
FSBus circuitry and also software is running if before stated precautions have been applied.
Best rgds
Peter
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