Hello Mark, good to know that there's t least one kindred spirit out there.
So I followed the advice in the old Volker Bandke post that was contributed a few days ago, and re-ran the DBDGEN using macros from MVT instaed of MVS (DCB and 3 IHB macros). Then I re-tried the TESTLOAD COBOL program and specified a VSAM cluster with AMP instead of an ISAM file for the TESTDB DD statement.
Didn't get very far, only as far as the first DL/I ISRT call...
Does anyone have any idea what a system FFF abend is? I found only one brief mention anywhere online, and it talked about "contention". I'll keep looking for other information online, but all ideas accepted in the meantime!
Thanks, JJ