The XMP1541 adaptor
The XMP1541 adaptor serves as a pair of an XM1541 multitask cable and an XP1541 or XP1571 parallel cable, allowing you to reuse your already existing Commodore serial cable and Commodore 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 adaptor:
The following PC softwares fully support this adaptor:
Actually, there are no plans or construction pages for this adaptor. Instead of building a genuine XMP1541 adaptor, you should build an XEP1541 adaptor - or use the one you already have - and create a "twisted" Commodore serial cable.
Take your already existing Commodore serial cable. Connect one serial plug into the serial port of your Commodore drive and the other serial plug into the serial port of the adaptor. Take your already existing Commodore parallel cable. If you have a parallel port on your Commodore drive then you can connect one end of the cable into it; otherwise the cable is, probably, just hanging out of the drive. Connect the user port plug onto the user port edge of the adaptor, being very careful not to do it upside down, that is, the top side of the user port plug should be leveled with that side of the adaptor with the plugs. Connect the parallel plug of the adaptor 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 XM1541 multitask 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