The Jargon File (version 4.4.7, 29 Dec 2003):

DPer
 /dee?pee?er/, n.

    Data Processor. Hackers are absolutely amazed that suits use this term
    self-referentially. Computers process data, not people! See DP.


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

DPer

   /dee-pee-er/ Data Processor.  Hackers are absolutely amazed
   that suits use this term self-referentially.  *Computers*
   process data, not people!

   See DP.

   [Jargon File]

   (1994-12-07)