In MAME/CB-Emu, chesscomputer ROM versions are presented with 2 different methods. Separate sets (my preference), or BIOS sets (Sandro's preference).

For example, to load RISC 2500 version 1.03, you change the BIOS setting. But to load Chess Challenger 10 version A, you load it with the cc10a driver. What is your preference? If there is a large difference in opinion, I'll consider changing it in MAME. fhub, maybe you can explain in German?