der Mouse wrote:
  I'd love to get hold of one, provided the
interface to the host is
 sufficiently documented for me to write the host-side software.  I've
 been giving serious thought to building a PROM burner out of discrete
 logic, but so far haven't collected the round tuits.... 
I have no tuit's here, but I can email you a MB7124 pdf data sheet.
Well here is a good place to start your collection.
http://www.quantumenterprises.co.uk/roundtuit/index.htm
  /~\ The ASCII                           der Mouse
I may build one later this fall if I can figure how to switch the
voltages From GND to +20 volts ???