> The values I know of, with their "old" definitions are:

This is exactly the information I am looking for - many thanks!

> The Use Keys came into use somewhere in the late 1960s.

That would explain why my original example for the 2540 had no S, but
the equivalent manuals for other S/360 era machines did - clearly a
transition.

> Before that,
> the same numbering system was used, but without the Use Keys, so it
> makes complete sense to sort without respect to the first alpha
> character as you show above.

Yes, while plowing through a bunch of 650 docs, I see no Use Keys, but
maybe something similar, as some have an alpha character either on or
not on your list, and some have just two numbers. The four number
middle section seems consistent.

> Of course the
> trailing revision number may not be present, and on occasion there may
> be no dashes.

I am not too worried about the revision suffix format. I will just
file the different revisions in numeric order.

> A few things from memory (failing rapidly):

This pretty much matches what I am seeing.

> Y - PLMs (logic manuals)

Maintenance in general.

> n - (numeric) general overviews and more salesy than technical pubs.

I have noticed a fair amount of these are Parts Catalogs - S131, S241, S124.

> Well, I digress... But it's logically still Friday.

I think my plan is to file these docs ignoring the Use Key, but using
everything else.

And then there is all the stuff that has no number...

--
Will

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