In a nice freebie haul that included a 128M Quadra 950, a 660AV, a Syquest external, an HP ScanJet IIc, DeskWriter C, there was an Optima Concorde 600 meg magneto-optical drive. This is the Sony SMO-E501 mechanism. On the back of the external SCSI box, there was a DIN-5 connector, like a keyboard connector, that piqued my curiousity. Inside, I saw that it was simply an external connector for 5 volt power. What might have this been used for? - John