The ABORT (Bank 0) subroutine - Elite on the BBC Micro and NES

       Name: ABORT                                                   [Show more]
       Type: Subroutine
   Category: Dashboard
    Summary: Disarm missiles and update the dashboard indicators
    Context: See this subroutine in context in the source code
 References: This subroutine is called as follows:
             * FRMIS calls ABORT
             * KILLSHP calls ABORT
             * Main flight loop (Part 3 of 16) calls ABORT


 Arguments:

   Y                    The new status of the leftmost missile indicator


.ABORT

 LDX #0                 ; Set MSAR = 0 to indicate that the leftmost missile
 STX MSAR               ; is no longer seeking a target lock

 DEX                    ; Set X to $FF, which is the value of MSTG when we have
                        ; no target lock for our missile

                        ; Fall through into ABORT2 to set the missile lock to
                        ; the value in X, which effectively disarms the missile
Dashboard: ABORT

[NES version, Bank 0]
