Number - Direction.  Check keypad on keyboard as reference.
A - Fire button
B - Flash button

Round    PL1   PL2     Weapon
1        6     9       Shot Gun
2        7     2B      Laser
3        A     7       3 Way
4        1A    8A      3 Way
5        4     3A      Shell
6        1B    7A      Laser
7        2AB   B       3 Way
8        1B    2A      Laser
9        7B    3AB     Shell
10       8A    7       3 Way

If you see an icon shaped like a mountain, get it - it will give
you the laser! (This bonus will not appear in every game, or at 
any particular level.)