Once you finish the key chip procedure, you replace it with the M526 chip, boot and all the setup options including the key chip menus will be available for changes. The keychip will allow you to clear all the settings and enable the key menu for setting up secured options like games and denominations. You need to make sure you have zero credits. There should be multiple posts regarding key chip use, but basically you replace the big 40 pin eprom with the purple sticker labeled M526 with the keychip. Shouldn't cost you more than $100 to get all that you need, probably even half that if you get a good price on the software. Upgrading to a set of gameking 5.x software would give you much better gameplay and options, but you will also need to change the daughterboard with the sound chips eproms to a Multimedia lite board (uses simms for the sound roms). You have a gameking with a 3902 mpu, running really old gameking 4.x software.