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Routines |
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Used by the routine at NextStep.
Used when the ship is in the same column as a step of a segment. When the horizontal speed is negative it sets bit 3 of the contact flags at ContactFlags and carries on at NextStep_Flags. Otherwise the next step is drawn.
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| FlagLeftContact | 52917 | LD A,(52411) | The horizontal scroll speed. | |
| 52920 | BIT 7,A | Jump to FinishStep_Next if bit 7 of A is clear. | ||
| 52922 | JP Z,FinishStep_Next | |||
| 52925 | LD A,(23601) | The contact flags. | ||
| 52928 | OR %00001000 | Set the bits of A that are set in 8. | ||
| 52930 | LD (23601),A | Update the contact flags. | ||
| 52933 | JP NextStep_Flags | Jump to NextStep_Flags. | ||
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