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

Get a real computer!
 imp.

    In 1996 when this entry first entered the File, it was the typical hacker
    response to news that somebody is having trouble getting work done on a
    system that (a) was single-tasking, (b) had no hard disk, or (c) had an
    address space smaller than 16 megabytes. In 2003 anything less powerful
    than a 500MHz Pentium with a multi-gigabyte hard disk would probably be
    similarly written off. The threshold for ?real computer? rises with time.
    See bitty box and toy.


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

Get a real computer!

    A typical hacker response to news that somebody is
   having trouble getting work done on a toy system or bitty
   box.

   The threshold for "real computer" rises with time.  As of
   mid-1993 it meant multi-tasking, with a hard disk, and an
   address space bigger than 16 megabytes.  At this time,
   according to GLS, computers with character-only displays
   were verging on "unreal".  In 2001, a real computer has a one
   gigahertz processor, 128 MB of RAM, 20 GB of hard disk,
   and runs Linux.

   [Jargon File]

   (2001-06-22)