CASIO fx-3900P memory increasing (with keystrokes) is possible?

[david sanz]

According to the information published in this site:

http://rskey.org/fx3900p

http://rskey.org/fx4000p

fx3900p and fx4000p were produced more or less simultaneously, with similar or the same set of functions, and externally they look alike

One remarkable difference is that fx4000p features almost five times the memory of fx3900p.

I suppose the only way to find out whether this procedure actually works is to get a fx3900p and try it.