I want to add "coin/credit management" to game launcher

I want to add "coin/credit management" to game launcher coins added throw coin door will be saved into memory and will be access later when selected game is running, by pressing player one or two button all coins added throw coin door will be excepted and put in to memory at all times. To use these coin credits, the player one start button will add`s 1 coin credit and player one start button starts the game. player two button will add`s 2 coin credits and starts a two player [login to view URL] is done when selected game is running. There is one problem that gets in the way of this depending on the game , some games boot right in to play mode reday to take credits and some games like say Ms Pacman have boot up and test screens , when the booting screens are running the game is not in play mode and is not reday, to take credits at this time. Ms Pacman has a 7 secand delay with boot screens befor in reday play mode to take credits. a possible work around is timer that locks out credit usage throw the start buttons till 7 secands has past. I want to be abule to set this timer for credit lock out on each game befor credit can be added , the user can test boot delay time befor setting delay/credit lock acordaingly So need settable timer for lock out on each game for start button player one and two for bootup times vary, coins to be save at all times throw coin door switch and saved in to memory i hope that helps a credit counter on bottom of game launcher front end screen