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25994: Increment alien bullet position
Alien bullet position is incremented to move it down the screen one pixel, then we jump back to the clear and redraw routine.
Used by the routine at move_alien_bullet.
Input
IX Alien bullet structure
inc_alien_bullet_pos 25994 LD A,(IX+1) Alien bullet xpos
25997 INC A Increment it
25998 JP has_alien_hit_barrier This writes in the new ypos value, checks for collisions, etc
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