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⌂ ∞ ▽ Elite on the BBC Micro and NES

Dashboard: ABORT2

[BBC Micro disc version, Docked]

       Name: ABORT2                                                  [Show more]
       Type: Subroutine
   Category: Dashboard
    Summary: Set/unset the lock target for a missile and update the dashboard

    Context: See this subroutine in context in the source code
 Variations: See code variations for this subroutine in the different versions
 References: No direct references to this subroutine in this source file




 Set the lock target for the leftmost missile and update the dashboard.



 Arguments:

   X                    The slot number of the ship to lock our missile onto, or
                        &FF to remove missile lock

   Y                    The new colour of the missile indicator:

                          * &00 = black (no missile)

                          * &0E = red (armed and locked)

                          * &E0 = yellow/white (armed)

                          * &EE = green/cyan (disarmed)



.ABORT2

 STX MSTG               \ Store the target of our missile lock in MSTG

 LDX NOMSL              \ Call MSBAR to update the leftmost indicator in the
 JSR MSBAR              \ dashboard's missile bar, which returns with Y = 0

 STY MSAR               \ Set MSAR = 0 to indicate that the leftmost missile
                        \ is no longer seeking a target lock

 RTS                    \ Return from the subroutine