Discs of Tron is an awesome game, but there's one major thing wrong with it: No freeplay mode. What a bummer! When you're having a party or having "arcade game newbie" friends over and you want to let them play the game without supervision, you probably don't want them fishing around inside the coin door and you don't want to have to run over and add credits every time it runs out either! Not only that but, when you do add credits, you can only add nine at a time and it sits there at the "press start" screen forever, burning the image onto your monitor. This was frustrating for me personally, so I decided to add a freeplay mode to the game.
Here's how it works:
Freeplay mode is turned on and off by setting switch 3 on the dip switch set SW1. When switch 3 is off, the game behaves as it always did. When switch 3 is on, Freeplay is activated. The game will display the word FREEPLAY where it formerly showed the number of credits and PRESS START where it used to say INSERT COIN. The game will still run through it's normal attract mode to help avoid screen burn-in. Pressing the start button will start the game without any credits needed.