A device attached to an ARPANET host to communicate with an IMP.  The communication interface is specified in BBN Report 1822.
List of interfaces:
-  BBN IMP-10, used by TENEX.
 
-  MIT DM IMP, used by MIT-DMS.  Made by Bob Metcalfe.
 
-  MIT KA IMP, used by MIT-AI, ML, and MC.
 
-  ACC LH/DH, UNIBUS.
 
-  DEC CSS IMP11-A, UNIBUS.
 
-  SRI DR11C, QBUS.
 
-  GIMPSPIF, used by 645 Multics.
 
-  ABSI, used by 6180 Multics.