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By default a screen number 0 with 16 colors and 320x200 is open by Amos.
The upper left point is (0,0) and the lower right corner is (319,199)
If you want to draw pixel, you can use "plot" (point) or "bar" (filled rectangle).
For example :
bar 100,100 to 200,150 : rem a rectangle of 100 pix wide and 50 pixels height
By the way, the zone commands have some bugs and sometimes defined zone throws some exception.
Don't know if it answers to your question.
If I can suggest something, it is to read carefully the manual, in particular the chapters about the screens and the graphics commands.
Bye
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