The initial comment says all that needs to be said:

/* Pace Serial Message Decoder, version 0.05

   by Rick Murray, 2006/07/03


   URI  : http://www.heyrick.co.uk/ricksworld/digibox/
   Email: heyrick -at- merseymail -dot- com


   Assembles with Borland TurboC++ v1.0 (a FREE download from Borland!).


   Requires DIRECT access to IRQ controller and serial port. Thus, it
   probably won't work on NT or XP...
   It makes a 16-bit DOS program so it should work on DOS 3.3 or later
   with UART hardware and an 80286 or later. Get an old 486 laptop or
   some sort of clunky AT-era clone? That'll do fine! You don't even
   need much memory! :-)

   
   You may modify this program as you see fit, and I encourage you to
   send me your updates. HOWEVER PLEASE NOTE THAT YOU DO NOT HAVE THE
   RIGHT TO (RE)DISTRIBUTE MODIFIED VERSIONS without first obtaining
   my permission. Just ask...
*/
