TXMODE SubroutineUsage: 
TXMODE (m) 
Description: 
Sets the video text mode. Setting the video mode is only relevant when used in the DOS environment.  
    0=Black and White 40 columns; 
    1=Color 40 columns; 
    2=Black and White 80 columns; 
    3=Color 80 columns; 
    7=Monochrome 80 columns; 
    64=EGA/VGA 43/50 lines. 
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