HP41.org

In Page 148 of 198, when I put in a CX at the keyboard
3
ENTER^
2
XEQ ALPHA ΣF$ ALPHA
ELP
ALPHA
it show nonexistent.
Any ideas what I am missing here?

A new version of sandmath http://www.systemyde.com/pdf/SANDMATH_4 ... al_VR7.pdf show this is called EPER now.
Works on the HP41CX with Clonix-d and SandMath in it.
XEQ
ALPHA
(sum)FL
shift
ENTER
SST
.. till EPER is seen
.. then click on XEQ