Extra tracks: Multiply80Percent

       Name: Multiply80Percent                                       [Show more]
       Type: Subroutine
   Category: Extra tracks
    Summary: Calculate (A T) = 0.80 * A
    Context: See this subroutine in context in the source code
 References: This subroutine is called as follows:
             * Hook80Percent calls Multiply80Percent


.Multiply80Percent

 STA U                  \ Set U = A

 LDA #205               \ Set A = 205

 JMP Multiply8x8        \ Set (A T) = A * U
                        \           = 205 * A
                        \
                        \ returning from the subroutine using a tail call
                        \
                        \ This calculates the following in A:
                        \
                        \   A = (A T) / 256
                        \     = 205 * A / 256
                        \     = 0.80 * A