On power-up F2 gets you into the BIOS setup screen.
Note: I've replaced the SODIMM - the original fitted RAM was 64MB
The boot options are:
My RWT205CE is running Windows CE Pro 5.
Mario's Itium 2920 is running Windows 4.2 CE NET PRO.
The Itium website does mention an Itium 2920L that runs a Linux 2.4 kernel.