Source : Free On-Line Dictionary of Computing

TRS-80
     
         A series of {personal computers} sold by {Tandy
        Radio Shack}.  The '80' refers to the use of {Zilog Z-80}
        processor (NOT {Intel 80x8x}).
     
        There were 7.5 computers in the TRS-80 line: Models I, II,
        III, 4, 100, 102, 200.  The Model 4P was a portable version of
        the Model 4 with no tape drive -- only 2 1/2-height single
        sided disk drives.
     
        Later models that Radio Shack produced were not TRS-80
        machines -- they were based on the {Intel 80x8x} architecture.
        These included Tandy 1000, Tandy 2000, Tandy 3000, and others.
        The 1000 had a proprietary Color card.  The 2000 was a
        powerful machine for its time, but was based on the {Intel
        80186}, so when {IBM} didn't build a computer based on this
        chip, it failed.  It was used to design a boat for the
        America's Cup.
     
        The TRS-80 {GUI}, DeskMate, was proprietary, but no more than
        {Windoze} at the time.
     
        Many joke about "{TRaSh-80}" machines but several models were
        in fact classics of their time.
     
        (1996-02-18)