Quote Originally Posted by rsocor01 View Post
So, according to your post then the number of nested gosubs will depend on the size of the stack. Is this correct?
Yes.

I am not familiar with this memory stack. Is this a part of the total PIC flash memory?
No. It is RAM, not Flash, but if you look in the datasheet under Memory Organization, you'll see it is not counted in the advertised RAM size. This is from the 12F683 d/s:

2.3.2STACK
The PIC12F683 family has an 8-levelx13-bit wide
hardware stack (see Figure2-1). The stack space is
not part of either program or data space and the stack
pointer is not readable or writable. The PC is PUSHed
onto the stack when a CALL instruction is executed or
an interrupt causes a branch. The stack is POPed in
the event of a RETURN, RETLW or a RETFIE
instruction execution. PCLATH is not affected by a
PUSH or POP operation.
The stack operates as a circular buffer. This means that
after the stack has been PUSHed eight times, the ninth
push overwrites the value that was stored from the first
push. The tenth push overwrites the second push (and
so on).
Note1: There are no Status bits to indicate stack
overflow or stack underflow conditions.
Note with this device, with an overflow condition, after 8 returns, you return to "0", which is a reset. Also note that different PICs have different sizes, behaviors and commands. (i.e. Some allow you to push/pop, others do not.)