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

TK-90X
TK-95

    A Brazilian clone, manufactured by Micro
   Digital, of the British Sinclair Research ZX Spectrum
   8-bit microcomputer.  It differed from the standard
   Spectrum by adding an Interface 2-compatible joystick
   interface, and extra BASIC commands to aid programming
   and graphics-editing.  Because of these differences, it was
   slightly incompatible with the standard Spectrum.

   A later model, the TK-95, which boasted an improved keyboard
   (similar to the Commodore 64's) and a more compatible ROM,
   was little more than a Timex TC2048 (another Spectrum
   clone) in disguise.

   comp.sys.sinclair FAQ
   (http://kendalls.demon.co.uk/cssfaq/).

   ["comp.sys.sinclair FAQ", D Burke M Fayzullin P Kendall et al,
   pub. Philip Kendall 1998]

   (1998-11-09)