The controls are the following:
O - Add 100 coins.
J - Increase bet by 1.
K - Increase bet by 10.
Space - Start spinning.
A - Stop the first column.
S - Stop the second column.
D - Stop the third column.
F - Stop all columns.
For those of you whom don't remember this game's bonuses, or for those whom never played it, they are the following: cherries, bells and bars. Pool is increased by 10 when landing a seven in the middle square and by 20 when you get a triplet of seven in the middle line.
Enjoy it !