At 14:53 -0600 on 02/04/2010, Rick Fochtman wrote about Re: Word-1 of
the Conventional Save Area:
That first word has been used at various times for control and/or
flag information by various processors, most notably PL/1 and ALGOL
in S/360 days. While some consider it a artifact now, of no useful
value, others may still use it for flag bits, etc.
It is currently used to indicate (via a FMTx value) when the format
of the save area is something other than the standard 18F format
(word1,backlink,forwardlink,R14,R15,R0-12).
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