HIPPI MIBs
The HIPPI-800 Switch MIB, version 1.01, dated April 14, 1997, by Marck Doppke of Essential Communications, is here in text format or in PDF format.
The HIPPI-800 end point MIB, version 01, dated September 1995, by John Renwick (written when he was with NetStar) is here in text format or in PDF format.
HIPPI-6400-PH End-Point MIB, version 0.45 (in PDF format), dated August 13, 1997, by Von Welch of NCSA is here. It is based on HIPPI-6400-PH Rev 1.4, and hence possibly out of date.