Help me with moving missiles horizontally!

[+atari2600land]

So I'm trying to move missile0 horizontally. I can, BUT when it reaches the side of the screen it doesn't do what I tell it to do. It just comes back the other side of the screen. I want player0 to fire the missile again. So I tried this:

Move_missile0_right:

        lda #$E0
        sta HMM0
        
        ; Update x position to account for HMM0 movement
        ldx MissileX+0
        inx            
        inx
        stx MissileX+0
    
        ; check if missile is far enough right yet
        cpx #150
        bcs Get_new_enemy_missile    

        jmp aaaaa

And of course, it won't work. I've attached the whole code here. Any ideas on why it won't work?

 

midspace17a.asm

[Nukey Shay]

Have you checked that the actual horizontal position of the missile is equal to the value in MissileX+0?

And since you are storing the position of the missile anyway, why bother using relative positioning within the program?  Use the PosPlayer subroutine for the missile before you draw the frame instead.

[+atari2600land]

Problem solved. As it turns out, I had put something in the wrong position in the code.