Drivers: AddRacePoints

       Name: AddRacePoints                                           [Show more]
       Type: Subroutine
   Category: Drivers
    Summary: Add the race points to the driver's total points
    Context: See this subroutine in context in the source code
 References: This subroutine is called as follows:
             * AwardRacePoints calls AddRacePoints


 Arguments:

   X                    The race position whose points should be added

   Y                    The driver who receives those points, i.e. who has then
                        added to their total accumulated points


.AddRacePoints

 SED                    \ Set the D flag to switch arithmetic to Binary Coded
                        \ Decimal (BCD)

 LDA totalPointsLo,Y    \ Add (0 racePointsHi racePointsLo) for position X to
 CLC                    \ (totalPointsTop totalPointsHi totalPointsLo) for
 ADC racePointsLo,X     \ driver Y, starting with the low bytes
 STA totalPointsLo,Y

 LDA totalPointsHi,Y    \ And then the high bytes
 ADC racePointsHi,X
 STA totalPointsHi,Y

 LDA totalPointsTop,Y   \ And then the top bytes
 ADC #0
 STA totalPointsTop,Y

 CLD                    \ Clear the D flag to switch arithmetic to normal

 RTS                    \ Return from the subroutine