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added info about ellipses and units
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@ -19,8 +19,19 @@ All drawing operations are clipped to the current viewport and window; parts of
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arcs, circles, lines, etc. that would be rendered outside the viewport are not
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drawn.
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If the size of the window has a different aspect ratio than the size of the viewport,
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the elements drawn will be stretched to fit. You can use this mechanism to draw ellipses
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or stretched text.
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Commands sent to the 401 are terminated by the ASCII "end of text" delimiter, 0x03.
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A semicolon may also be used.
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A semicolon or newline may also be used in some situations; however it's safest to
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terminate a text-writing command (PL) with 0x03.
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## Units
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The base units for the viewport (as used in the VP command) are approximately 1 unit
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= 0.1mm. (In practice, this is slightly off, so I don't recommend drawing any rulers
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with this machine.)
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### Serial connection
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