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Etch A Sketch by GDX
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This is a program like the drawing toy "Etch A Sketch" that works on 
MSX1, MSX2 or newer.


Use:

 First, use cursor keys to move the cursor. Press Space key to switch to 
 the tracing mode and draw what you want. Press CLS key to erase the screen.


Notes:

- When MSX2 or newer, the sprites can be badly displayed on some emulators 
  because only two sprites are used to make three colors. This function and 
  zoomed sprites are sometimes poorly emulated. (OpenMSX and BlueMSX are OK)

- On MSX2, the screen shakes when we erase it.

