Hi Docci.
Though this is a Handheld PC forum, I have some advice for you.
Cassiopeia E100, like other Palm-size PC, cannot upgrade its OS because it is embedded in a ROM.
(Unless the OEM provides a ROM upgrade
).
The ARM, MIPS, SH3, SH4 are all CPUs used by OEM until the Pocket PC 2002 came out, when they used only Strong ARM. Casio uses MIPS for Cassiopeia series with Palm-size PC and Pocket PC 2000. You should download softwares intended for MIPS, otherwise, the software will not work.
If you want to carry around pdf and other documents, I recommend getting a Compact Flash card.
Good Luck.
Tsubasa kato