Gentlemen,
The original difference between M2 and M30 was as follows:
M2 was a program stop
M30 was a program stop with a rewind.
For the individuals who never had the pleasure of running a 'tape'
machine a little explanation is in order.
A paper/Mylar tape reader would read the tape every time a part was
machined. The decision was made to leave the ends of the tape alone or to
connect the ends of the tape and create an endless tape. If you left the
paper tape ends unconnected you would then need to rewind the tape to the
front of the tape (program start position), hence an M30 would be needed to
tell the tape reader to run in reverse until it found the code indicating
the program start position.
When the paper tape ends were connected an M2 was used as a rewind was
not needed.
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