Re: OS in ROM
I had a Jornada 720, a Psion 3, and (slightly later) an iPaq.
Back around 2000... The Psion 3 and the 720 were a similar form factor, with little else in common. The Psion was a superb piece of hardware and software. The J720 hardware was rendered near useless by having Windows CE as the OS (in HPC2000 guise).
The iPaq was an interesting albeit not very useful piece of hardware, hampered by having Windows CE as the OS (in PocketPC guise).
Who would have thought back then that 15 years later it would have got *harder* to synchronise a handheld device (Android) with Outlook email (if you don't want to go via "the cloud"). Come back ActiveSync, all is forgiven?