The Free On-line Dictionary of Computing (19 January 2023):

UPS

   1. uninterruptible power supply.

   2. A source level C debugger that runs under X11 or
   SunView by Mark Russell .  Ups includes a C
   interpreter which allows you to add fragments of code simply
   by editing them into the source window.  Version 2.1.

   Ported to Sun, DECstation, VAX Ultrix, HLH
   Clipper.

   (ftp://export.lcs.mit.edu/contrib/).  Mailing list:
   ups-users-request@ukc.ac.uk.

   Unofficial enhancements by Rod Armstrong 
   (ftp://sj.ate.slb.com/misc/Unix/ups/contrib/rob).

   (1991-05-20)