Lisp 2022 on a Tops-10

[John G. Aspinall <JGA at MIT-MC>]

[I'm not sure this is where this inquiry should go, but
please redirect if necessary.]

I'm trying to use MacLisp on LLL-MFE.  It runs Tops-10, and the
lispversion is 2022.  The folks at LLL are not supporting it, but it
was installed and (I think) running once.  Certain things work, but it
appears that something is broken.  Two examples are:

1. Invoking IF

   DEFMAX 77 loads
   MLMAC  35 loads
 then it bombs out with an illegal UUO.

2. Invoking LET

   LET    90 loads
   DEFMAX 77 loads
 then it bombs out with an illegal UUO.

Can you tell me how to diagnose its problems, and/or what to
look for?  For instance the current MLMAC on MC is 92, is 35
so out of date that it is incompatible?

Thanks for any help,
			John.