(11C) X to Power of X Equation

[Gamo]

When I try X^X=10 with Newton's Method program which I used STO 5, RCL 5, Y^X, 10, - program steps and this work fine.
Then I try X^X=1000 Program keep running with Error 3. So I was thinking about loop count on this problem that might be the cause of the error or not enough memory.

About inserting program to solve problems.
What I think is that this program need to use repeat same register for each unknown X.
In the book example: X^6 - X - 1 = 0
Program: STO 5, 6, Y^X, RCL 5, -, 1,-

STO 5 for X^6
RCL 5, - for - X

Just wondering because program set up is not the same like 15C SOLVE

Gamo