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Routines |
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Used by the routine at ControlPlayer.
Counts down the bottom four bits of offset 02 of an entity, if they are not zero. While they are not zero UpdateVelocity moves the entity by a fixed step in the direction it is going, rather than by the controls.
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| AutoWalkStep | 8D6D | LD A,(IX+$02) | Fetch offset 02 of the entity. | |||||
| 8D70 | AND %00001111 | Keep only bits 0-3. | ||||||
| 8D72 | RET Z | Return if the result is zero. | ||||||
| 8D73 | DEC (IX+$02) | Decrease offset 02 of the entity by one. | ||||||
| 8D76 | RET | Return. | ||||||
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