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Missile 1 Horizontal Position not perfect


Cisano

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Hi. I have a problem.

I use this subroutine for horizontal positioning of GRP0 and Missile1.

I set the parameters of GRP0 and I call it and again for the M1

Position
        sec
        sta WSYNC
        bit 0
.DivideLoop
        sbc #15
        bcs .DivideLoop
        eor #7
        asl
        asl
        asl
        asl
        sta RESP0,y
        sta HMP0,y
        rts

GRP0 is perfect, I can position it pixel by pixel.

With missile not. The position seems every 3 pixels.

Is there some reason?

Thanks

 

 

Edited by Cisano
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