I'm not sure I completely understand the questions, but...

> I am running pocketPC for the E-125, would I notice an improvement by switching
> to E-10X?

No. Your E-125 is essentially a souped-up E-105. It has a slightly faster processor (and the newer OS).

> Is it compatible with my system?

Not exactly. You should be able to run my builds on your E-125, since they use the same basic CPU. However, the buttons may not work correctly, and the display may not show up correctly due to a few 'improvements' Casio made along the way.

> Vic

The only real use for my builds is E-100/E-105 devices.
However, Marconelly maintains "MAMEBoy" which is based on
the source I used, but works better on the Casio CE3.0 devices (EM-500/E-115/E-125). However, of course any
changes/improvements I make will be lagged in implementation, if they get implemented at all.

Darren