This subroutine allows an ASCII time sharing F77 program that is too large to fit into main memory to be executed as a sequence of smaller programs.
When CHAIN is called, the following events occur:
Since chained programs are loaded on top of each other, blank common may be used to pass data. The LOWLOAD option must appear in a "*$" line within the chained file. The first item declared in blank common must be a 36-word array that is not referenced by either the chaining or the chained program.
This technique is NOT recommended. A well thought out overlay structure will work much better.
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