I'm tinkering to connect the CBMStuff.com SuperCard Pro to eight-inch floppy drives. The SuperCard has a contemporary 34-pin floppy connector. The Terak 8510 main unit held a drive and its system cards, and its external 8512 drives just held a power supply and a floppy drive. The ribbon cables between 8510 and 8512 are 40 pin. The 8512 doesn't have its own power switch. The back of the 8512 has a small circuit board. (And by "back", I mean the board is actually exposed, which seems odd for a computer that's otherwise built as robust as aircraft or mil-spec.) It accepts the 50-pin cable from the internal floppy drive and has two 40-pin male for daisy-chain ribbons to the 8510 and additional 8512. The board has a socket for a drive terminator and a DIP for setting the drive ID. The 8512 power supply has a relay that must be sensing a signal on the 40-pin cable, as that's what turns on the 8512. Similarly, the Terak main unit's single power switch controls the Terak mono monitor. I haven't traced the signals on the board yet, and I have not yet found a doc that explains the cable pin-out. Because I have a bunch of 8512, it would be convenient for me to be able to use them as self-standing eight-inch drives. I purchased one of John Wilson's 50-pin Shugart to 34-pin adapters for its generation of the TG43 signal and the LED blinkenlightz. I'm tempted to tease out the Terak's 40-pin pinout and perhaps make some sort of adapter to go to 50-pin. - John