I take it you don't have the base for the Power CD? There is a base which has a power jack which takes a 7.5V-9V DC 15Watt adapter like the one for a Mac Portable or a PB 190, a standard 50-pin SCSI, and a compartment for a bunch of AA batteries. I have no idea what the pinout of the DB25 connector which connects the player to the base is, but it's not a Mac Plus SCSI connector.