This is the b5s4 PCB version of the XA1541 active adapter. It lets you connect Commodore disk drives to a PC with a parallel port, and read and write to real diskettes. Compatible disk drives: 1541, 1541-II, 1570, 1571 and 1581. Compatible software: The Star Commander, OpenCBM, NibTools, CMBXfer, Mtap & Ptap and cbm4linux.