I've spent most of this weekend laying out a new board design. It implements some of the improvements I mentioned before:

• Logic-based IO
• I2C Port Expanders allowing a smaller AVR to be used
• ATMega328p with appropriate pins wired for V-USB support
• Numerous fixes such as pullup resistors e.t.c
• I hand routed this one rather than using the auto router
• 5V Regulator so it is more tollerant of the power supply used
• Power LED

The biggest comment I have is... What with the port expanders, USB, and discrete logic IO. there are a lot of traces. As in, enough ttraces that I doubt I could fit any more on the board. There are a few things this design does not have that I said I'd add:

• Extra IO for external stuff
• Memory bank switching

I think it's enough for now though, to progress the project.

Here's a preview:

Progress on the host library I talked about is... slow. It's quite tedious to write so I've been tending to play with the hardware more. Ah well, I'm sure I'll get to it.