A device attached to an ARPANET host to communicate with an IMP. The communication interface, the Host-to-IMP Protocol, 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, UNIBUS (via a DR11-C) and QBUS (via a DRV11)
- GIMPSPIF, used by 645 Multics.
- ABSI, used by 6180 Multics.