On Tue, Jan 15, 2019 at 01:29:46PM -0500, Jim Mulder wrote:
>   WAIT processing was rewritten for MVS/XA, and the check for
> the communications ECB is in the mainline code, not in the FRR.

Great!

> There is no level of IEAVEWAT older than MVS/XA in our code
> repository, which suggests that WAIT processing was in a different 
> module in MVS/370.    I don't know which module that 
> was, so I can't look to see how it worked. 

On MVS 3.8 IEAVSY50 includes both wait and post.  Validity check is
in IEAVEVAL.

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