You have a great bill acceptor, however, an update is gonna cost ya. Mars officially no longer supports this model, but a third party vendor does with a complete replacement circuit board. Visit here:
http://www.pyramid5.com/vfm.htmlComplete plug 'n play installation. Just unplug the old Mars board and plug this one in instead. The replacement comes with the latest chip for the latest currency. If an upgrade is needed in the future it's just a simple $15 chip change you can do yourself.
I know, some people may say this is kinda pricey, but Mars bill acceptors are the very best out there. The most reliable, best running, longest lasting, and impossible to cheat/string. In my opinion this upgrade is worth every penny.
If you've ever priced a new Mars bill acceptor, you'll see what I mean. This retrofit board is well worth it.