Someone pointed me at this LCD game a few months ago: "Catch-A-Coke". I "guess" you could call one version of it coin-operated? I didn't know it was an LCD game until I started looking into it. http://www.emulab.it/forum/index.php?topic=4057.0 There's also a normal handheld version of it too.
The Vending machine unit is basically a larger version of it, and it has a normal chip in it: NEC D7502G 139 Is that one that can be dumped non-destructively? I can probably loan that out if it's dumpable... 'Kaken' is written on one of the circuit boards. I've never been 100% sure who that is, although an alternate spelling of 'Gakken' seems to make sense. The LCD still says 'Bandai Electronics'.
There's also a 'Spell Coke' game which seems to be a unique module just for the vending machines. I have that one too.