The classic remedy in situations of the sort Arthur Fichtl describes
is to write a macro, here one called MVCIN, that performs the
operation not supported on some target machines.

The HLASM will---and its immediate predecessors would---use a machine
instruction I known to it for a particular assembly and, failing that,
expand a macro named I known to it instead.

The distinction between assembly machine and execution machine---what
COBOL used to call source and target machines---is of course crucial
here, and in some environments it is difficult to make [or preserve
administratively] .

--jg

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