If that works and it loads i will seriously do research which of the to me available usb-vga adapters actually contains a sis chip (I live in germany and all adapters I found in online stores here have noname brands and useless technical specs). The difficult part imho would be getting X running with the sisusb driver (http://ftp.x.org/pub/X11R7.0/doc/html/sisusb.4.html), afaik the graphical interface on the n800 is not X but some framebuffer thing, I haven't looked at it yet so if anybody knows details