The translated HP-67 program you're trying to load and
run is far from optimal, or even efficient. Your best best
would be to get one from the former "HP-41C User's Library",
or even better, to look for one in the old issues of the
PPC Journal, available in CD-ROM.
If you do have or can get an HP-71B with a Math ROM,
this is the "program" that will do what you want,
particularized for a 100th-degree polynomial:
10 DIM P(101) @ COMPLEX R(100) @ MAT INPUT P @ MAT R=PROOT(P) @ MAT DISP R
I quoted "program" because you could easily execute that
from the command line, no need to enter a program. As
written, it does the following:
DIM P(101) dimensions a 101-element vector to hold
the 101 coefficients
COMPLEX R(100) dimensions a 100-element complex vector
to hold the 100 complex roots
MAT INPUT P prompts the user for each element. The
user can enter elements one by one or
several at a time, and can enter numbers
or expressions, even using variables
and functions
MAT R=PROOT(P) computes all 100 complex roots
MAT DISP R displays all roots
To make it general, just ask for the degree N, and then
use DIM P(N+1) and COMPLEX R(N) instead.
That's it. Amazingly simple and powerful !