PDP-10 Archive: exec/exec.bwr from tops20v41

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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.