41 with modules vs 42 (HP or SM)

[Gene]

Back to the original question :-)

If you are going to primarily write your own programs to solve you specific problems - the DM-42 will be much faster.

The benefit of the DM41 / HP-41CL is that you have access to hundreds of roms containing pre-written programs able to solve nearly anything.

Sandmath alone might be worth getting one of these models.
Sandmatrix too.
FunSTUFF - 32K of games.
TVM rom
Extended Stats
all HP roms.
All HP solution books.

and hundreds more. Already written. Already available on the DM-41 / HP-41CL.

Yes, run slower than the DM42, but fast by historical standards. :-)

I have all 3 - the DM-42 and DM41 and the HP-41CL.