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EXEC BEWARE FILE
The EXEC that was distributed with Versions 4.1 and 5.1 of
TOPS-20 was built from the same set of source modules.
There are slight differences between the two EXEC's. The
differences are due to some code being turned off by
conditional assembly in the 4.1 version. To build an EXEC
that runs under Version 4.1, use EXEC41.CTL. To build an
EXEC that runs under Version 5.1, use EXEC.CTL.
EXEC41 differs from EXEC in that it assembles the EXEC rel
files with NXEXEC.CMD, instead of ASEXEC.CMD.
NXEXEC.CMD differs from ASEXEC.CMD in that it assembles
EXECDE.REL with EXECNX.MAC, instead of EXECEX.MAC.
EXECNX.MAC turns off the XARCSW, and EXECEX.MAC turns it on.
EXEC FROM AUTOPATCH 7