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Routines |
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Gives the ship (at ShipObject) horizontal and vertical speeds that are the opposite of the two scroll speeds, with no fractions. Moving the ship at these speeds makes it stay in the same place on the screen.
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| SetShipSpeeds | 47596 | LD IX,51429 | The ship. | |
| 47600 | LD A,(52411) | The horizontal scroll speed. | ||
| 47603 | NEG | Negate A. | ||
| 47605 | LD (IX+7),A | Write A to offset 7 of IX. | ||
| 47608 | LD A,(52410) | The vertical scroll speed. | ||
| 47611 | NEG | Negate A. | ||
| 47613 | LD (IX+9),A | Write A to offset 9 of IX. | ||
| 47616 | LD (IX+8),0 | Store 0 at offset 8 of IX. | ||
| 47620 | LD (IX+10),0 | Store 0 at offset 10 of IX. | ||
| 47624 | RET | Return. | ||
| 47625 | NOP | Do nothing. | ||
| 47626 | NOP | Do nothing. | ||
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