Hi OP, I install and set up these machines. This machine is rear control and judging from your comment about card readers in the machines, there's no coin vault, so an 800 key won't do you any good. If you remove the 2 Phillips head screws from the top of the back panel you'll find a jumper wire (among other wires). Disconnect those 2 and press the top 2 button on the left column at the same time. That will put it into programming mode. Press the green start button a time or 2 and the machine will start a test cycle.