I was previously working on a ultra-portable PC using a EBX formfactor (size of a CDROM) motherboard, but I got tired of the large size of the board and the fact it didn't support 133MHz the Via C3 800 needed to run at full speed. I think I've mentioned the project before on these forums.
Recieved the new board, pretty cool. 1GHz Via Eden processor, USB 2.0, dual lans, takes a DDR2 SODIMM, Compact Flash type I/II socket, built-in audio, runs off 5Volts (see http://www.bcmcom.com/bcm_product_ebc3266.htm ). Still waiting on RAM to test it out. I decided on a portrait layout of the previous landscape layout. I borrowed an idea from the Sharp Zaurus, and the gamepad will be mounted above the keyboard and will slide down to reveal the keyboard. Not sure on the gamepad I'll be using.
Next to CD for size comparison:
On top of a tracing of the PSOne screen, ports view:
The new plans:
Tracings of the components for size references in the new portrait layout:
1 GHz Via Eden
256MB DDR2 RAM
20GB laptop harddrive
5" PSOne screen, with possibility of being replaced with a 6" VGA or SVGA LCD hooked to the board's controller later on.
Wifi via USB adapter
5200 mAh Li-Ion 9Volt cell, maybe times two.
MAX787 PMW circuit to take down 9Volts to 5Volts
OS: Linux (probably Vida Linux dist.)