| Game status buffer

7FC0: Bullet buffer 1

Used by the routines at 621E, 65DB and 6670.
7FC0 | DEFB $00 | x-coordinate of the leftmost column of the play area on screen the last time the bullet was drawn
7FC1 | DEFB $00 | Bullet's screen x-coordinate: x
7FC2 | DEFB $00 | Bullet's screen y-coordinate: y (0 if the bullet is not in flight)
The bits in the fourth byte of the bullet buffer have the following significance:
Bit(s) | Description
--- | ---
7 | Reset if the bullet is flying leftwards, set otherwise
6 | Reset if the bullet is flying perfectly horizontally, set otherwise (in which case bit 4 is also used)
5 | Unused
4 | Reset if the bullet is flying towards the ground, set if it's flying towards the sky
3 | Unused
0-2 | Pixel row at which the bullet should be drawn in the screen cell at (x,y)
7FC3 | DEFB $00 |