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

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)