     According to IBM's DOS Technical Reference Manual (for DOS Version 3.30)
the numeric values understood by ANSI.SYS are as follows:

Value      Meaning
 ---       ------
  0        All attributes off (normal white on black)
  1        Bold on (high intensity)
  4        Underscore on (IBM Monochrome Display only)
  5        Blink on
  7        Reverse video on
  8        Canceled on (invisible)
 30        Black foreground
 31        Red foreground
 32        Green foreground
 33        Yellow foreground
 34        Blue foreground
 35        Magenta foreground
 36        Cyan foreground
 37        White foreground
 40        Black background
 41        Red background
 42        Green background
 43        Yellow background
 44        Blue background
 45        Magenta background
 46        Cyan background
 47        White background

     For example, I usually have my screen set to display white letters on a
blue background.  The SGR escape sequence for this would be "ESC[37;44m".

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