Routines
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B5A9: Add Points To Score
Used by the routines at HandlerAmuletPiece, CollectPickup and AwardActorPoints.
Adds points to the score of the active player. The scores are held as three bytes, each with two BCD digits. The new score is then printed by Score_1UP.
Before
add-points-before
After AddPointsToScore
add-points-after
Input
BC Points to add to score
Check the active player.
AddPointsToScore B5A9 LD A,($969E) Jump to AddPointsToScore_2UP if the active player is 2UP.
B5AC AND A
B5AD JR NZ,AddPointsToScore_2UP
Set the score address for 1UP.
B5AF LD HL,$969A Point HL at the score of 1UP at 1UP_Score_3.
B5B2 JR AddPointsToScore_Start Jump to AddPointsToScore_Start.
Set the score address for 2UP.
AddPointsToScore_2UP B5B4 LD HL,$969D Point HL at the score of 2UP at 2UP_Score_3.
Process adding the points to the appropriate score.
AddPointsToScore_Start B5B7 LD A,(HL) Fetch the lowest pair of digits of the score.
B5B8 ADD A,C Add the low byte of the points to the digits (in BCD).
B5B9 DAA
B5BA LD (HL),A Store the new lowest pair of digits.
B5BB DEC HL Move onto the middle pair of digits.
B5BC LD A,(HL) Fetch the middle pair of digits of the score.
B5BD ADC A,B Add the high byte of the points to the digits, plus the carry (in BCD).
B5BE DAA
B5BF LD (HL),A Store the new middle pair of digits.
B5C0 DEC HL Move onto the highest pair of digits.
B5C1 LD A,(HL) Fetch the highest pair of digits of the score.
B5C2 ADC A,$00 Add the carry to the digits (in BCD).
B5C4 DAA
B5C5 LD (HL),A Store the new highest pair of digits.
Check the active player.
B5C6 LD A,($969E) Jump to Score_2UP if the active player is 2UP.
B5C9 AND A
B5CA JR NZ,Score_2UP
View the equivalent code in;
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