I remember the days of 1990 when I was writing an Assembler program. In
that program I experimented with MVCIN and it worked as designed (an
desired).
However, it worked on our *development* system which was an Amdahl MF.
After having installed that program on the production system which was
an IBM 3090 600J it crashed immeditately with an operation exception -
the IBM did not have MVCIN.
It costed substantial effort to develop a workaround.
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