NM and CM callable.
Alters current DB to Z area of the compatibility mode (CM) stack.
Operation Notes |
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When called from programs running in NM, only the CM stack is affected.
Programmatic expansion and contraction of the NM stack is not necessary.
Allows an NM program to alter the size of the current DB to Z area of
the CM stack by adjusting the register offset of the Z address from
the DB address (DB to Z).
Increases the Z address (CM stack expands) or decreases the Z address
(CM stack contracts). If the Z to DB area size requested
exceeds the maximum size permitted for the DL to Z (CM stack)
area, only the maximum size allowed is granted.
All changes to the DB to Z area are made in increments or decrements
of 128 half words (CM words); the size granted may differ
from the size requested.
