Paul Gilmartin asked: 

> So I wonder why the scheme chosen was not the last 4
> digits of yyyy+8900.  It would have matched the chosen
> scheme for the 20th and 21st centuries, and provided for
> smooth extension to the 19th and earlier.

Nobody was expecting to run into any SMF records with
dates earlier than 1968, nor have an OS/VS system IPLed 
with a current date in the 19th century (which was, of 
course, impossible, since the TOD epoch had been defined 
to be 1900).

Folks with problems like that already had their own
solution; they were unconcerned with the representation
of [MVS] system dates in SMF and RMF records, and the
like. 

--
WB

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