On 11/11/2008 17:13, Pete Turnbull wrote:
  I thought all NeXT mono monitors included the
 keyboard circuitry.  My 17" one certainly does; the 19-pin D-connector
 carries power and keyboard connections to the monitor, which provides
 the socket for the keyboard (which in turn has the power control as Ian
 says). 
I meant to add that answer L11 in the FAQ may be helpful if you don't
have a NeXT monitor:
http://www.lrz-muenchen.de/~heller/NeXT/HW_internal_FAQ.txt
--
Pete                                            Peter Turnbull
                                                Network Manager
                                                University of York