I managed to pick up a A3000 yesterday (for a measily $50AUS!), and it has a strange cable coming out of the side of the keyboard. It is a ribbon cable, with what looks like a 50 pin header on it. I popped the back cover off and the ribbon is spread all over the the pcb, connected to little resistors. Also, on the top of the keyboard is a GVP sticker over the function keys (I presume for a Genlock).
Any ideas?
(BTW, the motherboard is clean as a whistle inside. No battery leaks whatsoever!)