> Are there any ways to simulate a stack that is 40 bytes deep?

See the PUSHREGS and POPREGS macros in STD.INS.ASPIC at
http://www.embedinc.com/pic.  These push or pop a set of "general
registers" to/from a software stack.  The stack can be as large as any
available contiguous memory block.

On the 18 family the FSR registers can do auto increment/decrement, so you
don't need software to maintain a data stack.


*****************************************************************
Embed Inc, embedded system specialists in Littleton Massachusetts
(978) 742-9014, http://www.embedinc.com

--
http://www.piclist.com hint: The PICList is archived three different
ways.  See http://www.piclist.com/#archives for details.