KEY command with 50g and 39g

[Eddie Shore]

Say if I want the calculator to display random numbers to no end until the user presses a key.

If I create a game where the user "stops" the calculator to win (cyber)bucks.

The amounts for example would be "$500", "$1,000", "$2,500", "$5,000", "$0} to be displayed randomly for a second. When the user presses any key, the "wheel" is stopped and you get a message "You win $x!".

Any help is much appreciated,
Eddie