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⌂ ∞ ▽ The Sentinel on the BBC Micro

Sound: PlayMusic

       Name: PlayMusic                                               [Show more]
       Type: Subroutine
   Category: Sound
    Summary: Play a piece of music

    Context: See this subroutine in context in the source code
 References: This subroutine is called as follows:
             * MainGameLoop calls PlayMusic
             * PerformHyperspace calls PlayMusic
             * ProcessActionKeys (Part 2 of 2) calls PlayMusic
             * ShowGameOverScreen calls PlayMusic




 Arguments:

   A                    The number of the music to play (which is expressed as
                        a byte offset into the music data at musicData):

                          * 0 = hyperspace

                          * 25 = player has just transferred onto the Sentinel's
                                 tower

                          * 40 = U-turn

                          * 50 = game over

                          * 66 = landscape successfully finished



.PlayMusic

 STA musicCounter       \ Set the musicCounter to the value in A to start the
                        \ music playing from this point

 LDA #3                 \ Set soundEffect = 3 to tell the ProcessSound routine
 STA soundEffect        \ that this is music and should therefore be processed
                        \ using the ProcessMusic routine

 RTS                    \ Return from the subroutine

 EQUB &23               \ This byte appears to be unused