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Routines |
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Used by the routine at HandlerAccelerate.
Moves the car to a lower X position. If it would go below the start of the map then it bounces off the edge instead.
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| SubtractX | 28210 | EX DE,HL | HL=X position. | |
| 28211 | AND A | Subtract the result of the multiplication from the X position. | ||
| 28212 | SBC HL,DE | |||
| 28214 | SBC A,0 | Borrow from the top byte. | ||
| 28216 | JR NZ,HandlerAccelerate_StoreX | Jump to HandlerAccelerate_StoreX if the top byte is not zero. | ||
| 28218 | EX AF,AF' | Switch to the shadow flags. | ||
| 28219 | LD A,H | A=H. | ||
| 28220 | CP 128 | Jump to BounceX if the position is below 128 in the second byte. | ||
| 28222 | JR C,BounceX | |||
| 28224 | EX AF,AF' | Switch back. | ||
| 28225 | JR HandlerAccelerate_StoreX | Jump to HandlerAccelerate_StoreX. | ||
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