RESMP1 won't work.

[+atari2600land]

The computer is being a butthole and not making RESMP1 work. I have this beginning at line 924:

        lda #2
        sta RESMP1 
        
        lda #0
        sta RESMP1   

According to the "sacred scroll", this should work.

Missiles have an additional positioning command. Writing a "1" to D1 of the reset missile-to-player register (RESMP0, RESMP1) disables that missiles' graphics (turns it off) and repositions it horizontally to the center of its associated player. Until a "0" is written to the register, the missile's horizontal position is locked to the center of its player in preparation to be fired again.

I wrote 1 to D1 on RESMP1 to turn it on, then I wrote 0 to it to turn it off. Now the enemy never shoots EVEN THOUGH I WROTE 0 TO D1 OF RESMP1. I am tearing my hair out trying to find out why this is. Why won't the enemy shoot anything?

burger17.asm

[+atari2600land]

I think I fixed it. I still don't know why RESMP1 wasn't working, but I found a way around it.

[Thomas Jentzsch]

I checked your code, RESMP1 is working as expected, M1 is positioned at P1 + 4. You can check yourself in Stella's debugger.

 

The bug must be something else.

Edited October 7, 2021 by Thomas Jentzsch