Here is the RCX control for the drawing machines.  I decided to make multiple bases and have the two drive motors with the RCX and sensors removable from the bases.
LEGO RCX base
 LEGO RCX TURNTABLE Machine base 
 LEGO RCX 3 PEN Machine base
 LEGO RCX DOT Machine base
The machine is created completely by me (Tim Morrison) without directions. 
 
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