It's over 10 years old, and it's
microprocessor-compatible, but it's an
 analogue to digital converter chip, not a computer.  It's also not in
 my spares box, and I need one.  Does anyone have a spare?  Or a data
 sheet? 
I can't find a chip (although it sounds familiar for some reason), but I
do have a Ferranti data book that covers it. What do you need to know?
-tony