How It Works
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After turning on the RCX and selecting program #1

Press the green 'run' button.
The program waits for you to press the grey 'input' button.
While you hold that button down, the lamp comes on and you hear a F# quarter-note once per second.  Each time the note sounds 100 revolutions are added. 
After you release the button there is a brief delay.  Then the watch turntable begins to rotate clockwise (no pun intended).
At approximately 360 degrees, or one revolution, it pauses, for a second.  Then it reverses and turns one revolution counterclockwise.
Each time it pauses, between revolutions, the digital readout on the RCX shows how many revolutions remain to complete the sequence.
When the count reaches zero, the program stops.

After turning on the RCX and selecting program #2, the same sequence of events occurs, except that there is no alternation between clockwise and counterclockwise.  It only turns clockwise, pausing as before between revolutions.

Program #3 on the RCX is similar to #2 except that rotation is only counterclockwise.  The 'program' to follow shows Program #1 only;  #2 and #3 are similar.

Onward to the Software