[GreenKeys] M33 "O" (oh) vs "0" (zero)

[WA5CAB at cs.com]

I remembered seeing the backwards convention somewhere but didn't remember 
it being IBM.  I always assumed it was one of those "Not Invented Here" 
thingies.

In a message dated 4/17/2010 6:09:27 PM Central Daylight Time, 
jhhaynes at earthlink.net writes: 
> I seem to recall that in the distant past the IBMers used a slashed
> oh and unslashed zero in writing keypunching sheets.
> 

Robert Downs - Houston
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