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⌂ ∞ ▽ Aviator on the BBC Micro

Sound: ToggleEngineSound

       Name: ToggleEngineSound                                       [Show more]
       Type: Subroutine
   Category: Sound
    Summary: Turn the engine sound on or off

    Context: See this subroutine in context in the source code
 References: This subroutine is called as follows:
             * ApplyFlightModel (Part 6 of 7) calls ToggleEngineSound
             * Crash calls ToggleEngineSound
             * SetEngine calls ToggleEngineSound
             * TerminateGame calls ToggleEngineSound




 Arguments:

   A                    Defines the action:

                          * 0 = turn engine sound off

                          * Non-zero = turn engine sound on with pitch A



.ToggleEngineSound

 BNE MakeEngineSound    \ If A is non-zero then jump to MakeEngineSound to set
                        \ up and make the engine sound

 LDA #0                 \ Make sound #0, to turn off the engine sound
 JSR MakeSound

                        \ Fall through into ResetEngineSound to reset the pitch
                        \ of the engine sound