poseidon last version work OK with spider2.
BTW, I have used some months ago an USB hardware who cause read error and finally the smae on the PC side. The hardware was just too cheap and not reliable.
support for spider2 is stopped forever by the poseidon author !!!!! Next poseidon relase will work ONLY with deneb and highway hardware !!!
The actual poseidon software is the last version for 68k spider2 and the author not register poseidon anymore for all the peoples. Poseidon now is selling ONLY with hardware (highway, deneb,...).