Dr. Ido wrote:
  There were at least a couple of versions of tetris
that ran in text mode.
 From memory the Spectrum Holobyte release included
a tiny text mode version 
 (~8kb .com file) along with the graphic version.  The
others were probably
 PD/shareware and weren't
 actually called tetris. 
The original Tetris was 40-column text mode, MS-DOS.  underdogs should have it
(