On May 10, 11:50, Tony Duell wrote: That's what mine are like, too. The drives in the Sony WP were the same as the Apricot ones, mentioned in another reply, and Sony and Apricot upgraded to double-sided at about the same time. I've got the tech and service manuals for those drives, too. The 26-pin connector has the same signals as a modern 34-pin (barring ones that wouldn't be relevant here) and you can certainly make a simple adaptor. However, the data rate in the Sony and old Apricot systems was twice the normal rate for double-density, and the drives spin at 600 rpm instead of 300 rpm, so you can't just swap for a modern drive without changing other things to (like the PLL and differentiator circuit, and the BIOS). I've got that reprint somewhere, too. "Let Your Fingers Do The Talking", Byte August 1978 and September 1978. A 16 x 16 grid of emitters/sensors. A box near the ned of the article says "An industrial grade alphanumeric terminal incorporating touch panel input is being manufactured. For information contact: General Digital Corp, 700 Burnside Av, East Hartford CT 06108". Another box says, "NOTE: Any one building a unit from these designs should be advised that they are covered by a number of patents by the University of Illinois and may not be sold for profit". -- Pete Peter Turnbull Dept. of Computer Science University of York