(9821) Third-Party Software? (VAX-11 RSX, RT-11)

[User]

I work as a programmer for UCLA at Mt. Wilson
in astronomy. We have some extremely old computers running obsolete operating
systems
including an LSI-11/2 running RT-11 from about
1978. I need to assemble MACRO programs for
that computer but could do without the entire
operating system. Would that be possible on a
VAX using compatibility mode? I tried a test
and got the respose that the vax couldn't find
a program called RSX.EXE. Would it be possible
to install compatibility mode on VMS V5.4-2?
Could compatibility mode handle RT11 stuff?
Thank you in advance, John Boyden, Programmer, UCLA

[Wizard]

The OpenVMS compatibility mode request invokes the PDP-11 RSX-11
operating system environment and the associated layered product,
and not the PDP-11 RT-11 environment.

You likely seek either an RT-11 programming environment (running
as a native operating sustem platform, or running on an emulator),
or a set of cross-tools. Neither of these are part of OpenVMS
itself.

Mentec Inc. owns the RSX compatibility mode environment for OpenVMS,
and the VAX-11 RSX associated layered product, and the PDP-11
operating systems.