//C02 Color Functions
//Prototype - Subject to Change

  txtclr(c);          Sets text color to system color c. 
            
                      Note: May call system routine or may print color change
                      sequence.

  bkgclr(c);          Sets background color to system color c.
                      
                      Note: May call system routine or may print color change
                      sequence.


Assembly Constants (Defined in System Header file)

  BLACK             Code for color Black
  BLUE              Code for color Blue
  GREEN             Code for color Green
  CYAN              Code for color Cyan
  RED               Code for color Red
  MAGNTA            Code for color Magenta
  YELLOW            Code for color Yellow
  WHITE             Code for color White
   
  BREAK             ASCII code for Break/Stop Key
  BCKSPC            ASCII code for Backspace key
  CLEAR             ASCII code for Clear Key
  DELETE            ASCII code for Delete key
  DOWN              ASCII code for Cursor Down Key
  ENTER             ASCII code for Return/Enter key (usually CR)
  ESCAPE            ASCII code for Escape/Abort key (usually ESC)
  FNx               ASCII code for Function Key x
  HOME              ASCII code for Home Key
  INSERT            ASCII code for Insert Key
  LEFT              ASCII code for Cursor Left Key
  RIGHT             ASCII code for Cursor Left Key
  TAB               ASCII code for Tab Key  
  UP                ASCII code for Cursor Up Key

  BTMLFT            ASCII code for Box Drawing Bottom Left Corner
  BTMRGT            ASCII code for Box Drawing Bottom Right Corner
  BTMTEE            ASCII code for Box Drawing Bottom to Cetter Tee
  CTRCRS            ASCII code for Box Drawing Center Cross
  HRZLIN            ASCII code for Box Drawing Horizontal Line
  LFTTEE            ASCII code for Box Drawing Left To Center T
  RGHTEE            ASCII code for Box Drawing Right To Center T
  TOPLFT            ASCII code for Box Drawing Top Left Corner
  TOPRGT            ASCII code for Box Drawing Top Right Corner
  TOPTEE            ASCII code for Box Drawing Top to Center T
  VRTLIN            ASCII code for Box Drawing Verical Line
