Extra tracks: Hook80Percent

       Name: Hook80Percent                                           [Show more]
       Type: Subroutine
   Category: Extra tracks
    Summary: Set the horizonTrackWidth to 80% of the width of the track on the
             horizon
  Deep dive: Secrets of the extra tracks
             Code hooks in the extra tracks
    Context: See this subroutine in context in the source code
 References: This subroutine is called as follows:
             * newContentHi calls Hook80Percent
             * newContentLo calls Hook80Percent


.Hook80Percent

 JSR Absolute8Bit       \ Set A = |A|, so A contains the arc of the track at
                        \ the horizon (i.e. the track width on the section or
                        \ segment at the horizon) in terms of the high bytes
                        \ (this is the same as the original code that we
                        \ overwrote

 JMP Multiply80Percent  \ Set the following:
                        \
                        \   (A T) = 0.80 * A
                        \
                        \ and return from the subroutine using a tail call

 EQUB &4C, &EF          \ These bytes appear to be unused
 EQUB &53