Doodle is a simple vector drawing application.
Use an analogue joystick in port 1 (or Lightpen in port 2 for the Lightpen version).
Joystick/Lightpen : Move cursor
Button 1 : Clear screen and reset to center
Button 2 : Hide/Show cursor
Button 3 : Draw to selected point
Button 4 : Move to selected point
Doodle will beep if the line you are trying to draw is too long or if you have ran out of lines (maximum of 255 lines).
Happy doodling!
Free ROM Downloads
Joystick Version
http://binarystarsoftware.com/bin/DOODLE_v1.BIN
Lightpen Version
http://binarystarsoftware.com/bin/DoodleLPv1.BIN