Managed to get a pretty good price on a 1996 Wacom ArtPad II (rs232 serial version) with no stylus or powersupply, slightly damaged!
(probably a bit of a thread?)
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Chop the cable and strip back the wires, flip the polarity by soldering black to red and vice versa, now we have a centre negative 9v usb to barrel jack cable :)
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The missing stylus could have been a more serious issue but thankfully this particular wacom technology is still used today (or at least in the 2010s) in some samsung tablets and phones, which means it's still possible to get a stylus that works. We actually have this one that looks like a fake pencil.
Importantly, this all means I can now use a graphics tablet on my Amiga 1200 
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Still need to source the right version of some software for usable pressure sensitivity, but so far so good :)
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Since the original power supply would have been for 100 or 110v, and I live in a country with ~230v, I wasn't bothered about the missing power. This device needs 9 volts via a barrel jack that feeds into the serial connector, and unusually it's 'centre negative'.
Modern USB can request various voltages, and I had a 9v cable with the right connector, but it's the wrong polarity, having the centre positive. I want the meter to read -9.00, not 9.00