Turtle Graphics were what made LOGO popular, yet
COMAL has had a faster turtle for years! These
Turtle commands work on all COMALs (note that
AmigaCOMAL includes many more Graphics
commands):

BACK : move turtle backwards
  back(length)
  back(50)

BACKGROUND : set screen background color
  background(color number)
  background(2)

CLEAR : clear the graphics screen
  clear // also can use clearscreen

DRAWTO : draw a line from current point 
  drawto(x coord,y coord)
  drawto(50,80)

FILL : fills in area with current color 
  fill(x coord,y coord)
  fill(50,80)

FORWARD : move turtle forward
  forward(length)
  forward(100)

GETCOLOR : returns color of specified pixel
  getcolor(x coord,y coord)
  print getcolor(50,80)

GRAPHICSCREEN : turn on graphic screen
  graphicscreen(mode) //Power Driver use:
  graphicscreen(0)      //SETGRAPHIC(mode)

HIDETURTLE : make turtle invisible
  hideturtle

HOME : put the turtle in its home position
  home

LEFT : turn turtle left
  left(degrees)
  left(90) // a right angle

MOVETO : move to loc without line 
  moveto(x coord,y coord)
  moveto(50,80)

PENCOLOR : set turtle drawing color
  pencolor(color number)
  pencolor(2)

PENDOWN : put pen down, turtle draws
  pendown

PENUP : pick pen up, turtle does not draw
  penup

PLOT : plot a point in current color 
  plot(x coord,y coord)
  plot(50,80)

PLOTTEXT : put text on graphics screen 
  plottext(x coord,y coord,text$)
  plottext(0,24,"press space to continue")

RIGHT : turn turtle right
  right(degrees)
  right(180) // reverse direction

SETHEADING : set turtle heading
  setheading(degrees)
  setheading(180)

SETXY : set turtle x, y coordinates 
  setxy(x coord,y coord)
  setxy(50,80)

SHOWTURTLE : make turtle visible
  showturtle

TEXTSCREEN : turn on text screen
  textscreen //Power Driver use SETTEXT

TURTLESIZE : set turtle size (0 to 10)
  turtlesize(size)
  turtlesize(6)