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Routines |
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Used by the routine at Action_AddToScore.
Adds the points in A to the two-byte BCD score at Score. The low byte is adjusted with DAA; when that addition carries, the high byte increases by one.
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Preserve HL and load the current score from Score.
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| AddToScore | AD34 | PUSH HL | Stash HL on the stack. | |||||
| AD35 | LD HL,($A107) | Fetch the BCD score from *Score into HL. | ||||||
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Add the points into the low score byte and adjust for BCD.
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| AD38 | ADD A,L | Add the points in A to the low score byte in L. | ||||||
| AD39 | DAA | Decimal-adjust A for a BCD score digit. | ||||||
| AD3A | LD L,A | Store the adjusted low byte back in L. | ||||||
| AD3B | JR NC,AddToScore_Store | Jump to AddToScore_Store if the addition did not carry. | ||||||
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The low byte carried, so raise the high score byte.
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| AD3D | INC H | Increase the high score byte in H by one. | ||||||
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Write the updated score back to Score.
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| AddToScore_Store | AD3E | LD ($A107),HL | Store HL at Score. | |||||
| AD41 | POP HL | Restore HL from the stack. | ||||||
| AD42 | RET | Return. | ||||||
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View the equivalent code in;
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