Source : Free On-Line Dictionary of Computing

IBM PC XT
     
         An {IBM PC} with a (slow) {hard disk}.  The XT was
        released in March 1983.  It had an {Intel 8088} {CPU}.  The
        XT/370, released in October 1983, added {IBM 370} {mainframe}
        {emulation}, and the XT 286 followed in September 1986 with an
        {Intel 80286} CPU [Why?].
     
        (1996-05-21)