On 8/20/06, Chuck Guzis <cclist at sydex.com> wrote:
  Isn't the Mostek MK5025 a compatible part?  IIRC,
it can be used on either
 an 8 or 16 bit bus.
 
http://www.tranzistoare.ro/datasheets/restul/502155_DS.pdf 
There's a pinout and some sample code for the PDP-11 in the DPV-11
(M8020) manual...
http://bitsavers.org/pdf/dec/qbus/EK-DPV11-TM-002_Nov80.pdf
-ethan