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Routines |
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Used by the routines at MoveObjectBackAndForth and StartTerrainCheck.
Negates both speeds of an object.
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| ReverseObjectSpeed | 90CD | LD H,(IX+$07) | Fetch the horizontal speed into HL. | |||||
| 90D0 | LD L,(IX+$08) | |||||||
| 90D3 | CALL NegateNumber | Negate it. | ||||||
| 90D6 | LD (IX+$07),H | Store the new horizontal speed. | ||||||
| 90D9 | LD (IX+$08),L | |||||||
| 90DC | LD H,(IX+$09) | Fetch the vertical speed into HL. | ||||||
| 90DF | LD L,(IX+$0A) | |||||||
| 90E2 | CALL NegateNumber | Negate it. | ||||||
| 90E5 | LD (IX+$09),H | Store the new vertical speed. | ||||||
| 90E8 | LD (IX+$0A),L | |||||||
| 90EB | RET | Return. | ||||||
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