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Routines |
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Used by the routine at HandlerAccelerate.
Moves the car to a lower Y position. If it would go below the start of the map then it bounces off the edge instead.
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| SubtractY | 6DEF | EX DE,HL | HL=Y position. | |
| 6DF0 | AND A | Subtract the result of the multiplication from the Y position. | ||
| 6DF1 | SBC HL,DE | |||
| 6DF3 | SBC A,$00 | Borrow from the top byte. | ||
| 6DF5 | JR NZ,HandlerAccelerate_StoreY | Jump to HandlerAccelerate_StoreY if the top byte is not zero. | ||
| 6DF7 | EX AF,AF' | Switch to the shadow flags. | ||
| 6DF8 | LD A,H | A=H. | ||
| 6DF9 | CP $80 | Jump to BounceY if the position is below 80 in the second byte. | ||
| 6DFB | JR C,BounceY | |||
| 6DFD | EX AF,AF' | Switch back. | ||
| 6DFE | JR HandlerAccelerate_StoreY | Jump to HandlerAccelerate_StoreY. | ||
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