*All* handheld computers are a mess. Google up the PSION Organizer II some time. My example was made the year I was born... 1986. There are two PCBs and a ribbon cable inside your average Org2, and the traces on the motherboard are positively draconian -- they have a habit of jumping from one side to the other three or four times on their way to the ribbon cable...
That's just the top side of the mainboard... there's a 36-key keyboard on the other side, along with another plate of spaghetti traces! Mind you that's the deluxe "LZ64" model, although it's not really any more complicated than the rest of 'em. For the curious... the three chips at the top are LCD drivers, HD44780s. The big chip below and to the left is the HD6303-series CPU (sort of an enhanced Motorola 6800). Below that is the RAM (all 64k of it, lol) and what I suspect is an early gate array, and below those would be the ROM. Note that it actually uses chip resistors... the cheaper ones used carbon strips deposited on the board. Not kidding!
Why do I care? There's a small community still, based around that thing, and I (not quite realizing what I was getting into) volunteered myself to reverse-engineer it. I think I might've made a mistake...
