I guess I waited as long as I could to upgrade my MEI bill acceptors. I got the Mars 115 volt programmer from Randy Nix at Eagle Car Wash and it was easy to do.
The MEI directions were incorrect and I had to flip all the switches to off and turn on 8 (not 6). The flasher wire harness can only be installed one way correctly (note pins picture 2-3).
When the light turns green the programmer flashed the bill acceptor.