The XAP1541 cable combo
The XAP1541 cable combo is a Y-shaped cable that is, actually, a pair of an XA1541 active cable and an XP1541 or XP1571 parallel cable. It's compatible with PS/2, EPP and ECP parallel ports and with Commodore 1541, 1570 and 1571 drives.
You need the following hardware to make use of this cable:
The following PC softwares fully support this cable:
You can find the details on how to build this cable at the construction page.
Connect the serial plug into the serial port on your Commodore drive. Connect the parallel plug into the parallel port on your Commodore drive. Connect the PC parallel plug into the parallel port of your PC.
Make sure to put your equipment far away from monitors, TV sets and other devices with strong emission, otherwise cables may pick up interference and you may experience data loss or corruption.
The XA1541 active cable is © by Michael Klein and Nicolas Welte, 2000. The XP1541 and XP1571 parallel cables are © by Joe Forster/STA, 1997. If you produce and sell cables or adaptors that are compatible with this adaptor or the cables it implements then you must give credits to the respective copyright owners. If your adaptors are built onto printed circuit boards then you must also make the complete layout available in a format and resolution that is suitable for high quality reproduction.
Source: The Joe Forster-STA homepage