KEY FUNCTIONS FOR CAD 3.0

  ! -> TOGGLE SCREEN1 AND SCREEN2
  # -> INVERT SCREEN1
  & -> ADD SCREEN2 TO SCREEN1
  = -> COPY SCREEN1 TO SCREEN2
CLR -> CLEAR SCREEN 1
DEL -> UNDO LAST DRAW
  A -> BROKEN LINES
C=a -> LOAD DOODLE COMPRESSED FORMAT
  b -> BOX
  B -> BOXES (SOLID)
C=b -> SAVE DOODLE COMPRESSED FORMAT
  c -> CIRCLES (DIAMETER)
  C -> CIRCLES (RADIUS)
C=c -> COLORS
  d -> DISCS (DRAW)
  D -> DISCS (ERASE) 
C=d -> DISK FUNCTIONS
  e -> ERASE (LINE)
  E -> ERASE (BOX)
C=e -> LOAD RLE FORMAT
  f -> FIGURES
  F -> FREEHAND DRAW
C=f -> SAVE RLE FORMAT
  G -> GRID
  h -> HEXAGONS
  i -> INDICATORS ON
  I -> INDICATORS OFF
  j -> VERTICAL FANOUT
  J -> HORIZONTAL FANOUT
  k -> ELLIPSE
  K -> PARALLEL LINES
  l -> LINES
  L -> LINES (CONTINUOUS)
C=l -> LOAD DOODLE FORMAT
  m -> MORE DRAWING ROUTINES
  M -> EVEN MORE DRAWING ROUTINES
C=m -> SPECIAL FUNCTIONS
  n -> ENQUIRE
  o -> ZOOM
  O -> STAMP
  p -> PARALLELOGRAMS
  P -> POLAR COORDINATES
C=p -> PRINT MENU
  Q -> QUIT CAD
  r -> RECTI-LINEAR LINES
  R -> RADIAL LINES
C=r -> LOAD HIRES FORMAT
  s -> SNAP
C=s -> SAVE DOODLE FORMAT
  t -> TEXT
  u -> DRAW RLE BORDER
  U -> ERASE@	 E BORDER
  w -> WAVEFORMS
  W -> WINDOW
C=w -> SAVE HIRES FORMAT
  x -> CROSSHATCH
  y -> MARK SCREEN2 Y LOCATION
  Y -> MARK SCREEN2 X LOCATION
  z -> DRAW BORDER
  Z -> ERASE@BORDER
