[GreenKeys] 7.00 vs 7.42 unit code

[Jim Haynes]

And as additional evidence, I haven't looked at it just now but I think if
you look at the parts books you will find only one set of parts for the
printers and reperfs, but separate parts for keyboard and tape readers
for 7.00 and 7.42 code.

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 	"Ya can argue all ya wanna, but it's dif'rent than it was."
 	"No it ain't! No it ain't!  But ya gotta know the territory."
 		Meredith Willson, The Music Man