Maths (Arithmetic): MLU1

       Name: MLU1                                                    [Show more]
       Type: Subroutine
   Category: Maths (Arithmetic)
    Summary: Calculate Y1 = y_hi and (A P) = |y_hi| * Q for Y-th stardust
    Context: See this subroutine in context in the source code
 References: This subroutine is called as follows:
             * STARS1 calls MLU1
             * STARS6 calls MLU1


 Do the following assignment, and multiply the Y-th stardust particle's
 y-coordinate with an unsigned number Q:

   Y1 = y_hi

   (A P) = |y_hi| * Q


.MLU1

 LDA SY,Y               ; Set Y1 the Y-th byte of SY
 STA Y1

                        ; Fall through into MLU2 to calculate:
                        ;
                        ;   (A P) = |A| * Q