V.E.R.A. -- Virtual Entity of Relevant Acronyms (February 2016):

ISPS
       Instruction Set Processor Specifications (HDL)


The Free On-line Dictionary of Computing (30 December 2018):

ISPS

   Instruction Set Processor Specifications.  Operational
   hardware specification language.  Successor to ISPL.

   ["Instruction Set Processor Specifications", M.R. Barbacci et
   al, IEEE Trans Computers, C-30(1):24-80 (Jan 1981)].

   [Bell, Newell, Siewiorek, Barbacci 1982?]