Any chance you can post a scan of this board?  I'd like to compare it to some of
the ones from my Cosmac Development System -- scans at
http://home.earthlink.net/~msmith6020/Cosmac/
-W
  I've just found something rather rare, and I'm
willing to part with it,
 so...
 For Sale or Trade (Not listed on eBay!):
 An RCA CDP 1801 CPU board, New Old Stock, with matching edge-card
 connector. The PCB artwork is labled "RCA GPA 3903822/02 PCA 47-5", and
 "3901822".
 This is a 4.25 inch by 2.75 inch (including fingers) blue-colored PCB
 with a 40-pin CDP1801UD data path chip and its
 associated 28-pin SSTC TA6890W control store ROM, along with some
 passive support components.  The IC's are
 in white ceramic with gold covers.  Even the Beckman 22K resistor DIP is
 in a white ceramic package.  PCB traces are tinned over a blue
 substrate, with a 44-pin gold edge finger connector.
 The mating connector is a Sullins ETM22DSEH in a matching blue color,
 for some reason (because is looks really cool?).
 This two-chip CPU is a very early example of the RCA COSMAC CPU design
 built prior to the much more common CDP1802 single-chip processor.
  Dates codes are 7539 for the data path, and 7525 for the SSTC chip.
  Condition is absolutely mint, NOS-condition, but untested.  No
 documentation, but I ~MAY~ be able to find something on this board, just
 don't count on it.
 I'll also include a pair of vintage HP hexidecimal displays exactly like
 those used on the original ELF project, to make this combo the starting
 point for a really special ELF project.
 (Some ceramic 1852's may also be available)