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Routines |
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Used by the routine at CheckMapObjectCollisions.
Makes the ship rebound after hitting something above or below it: the vertical speed of the ship is reversed and halved by ReverseAndHalveSpeed.
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| BounceVertically | 43541 | PUSH HL | Stash HL on the stack. | |
| 43542 | LD HL,(51438) | Fetch the word at 51438 into HL. | ||
| 43545 | CALL ReverseAndHalveSpeed | Call ReverseAndHalveSpeed. | ||
| 43548 | LD (51438),HL | Update the high byte of the ship's vertical speed. | ||
| 43551 | LD A,H | A=H. | ||
| 43552 | LD H,L | H=L. | ||
| 43553 | LD L,A | L=A. | ||
| 43554 | CALL UpdateVerticalScrollSpeed | Call UpdateVerticalScrollSpeed. | ||
| 43557 | POP HL | Bring HL back off the stack. | ||
| 43558 | RET | Return. | ||
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