"Was the syntax upward-compatible?"
Yes, it was - mostly. My ATTCHJRG command processor was 100% compatible with
how you called ATTCHMVS, except it supported one additional parameter:
TASKDD(ddname). If you supplied that, then it would pass whatever you had
previously allocated to ddname as a TASKLIB on the ATTACH macro call. If you
didn't supply TASKDD, then it worked exactly like ATTCHMVS.
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