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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 | B9EC | LD IX,$C8E5 | The ship. | |
| B9F0 | LD A,($CCBB) | The horizontal scroll speed. | ||
| B9F3 | NEG | Negate A. | ||
| B9F5 | LD (IX+$07),A | Write A to offset 07 of IX. | ||
| B9F8 | LD A,($CCBA) | The vertical scroll speed. | ||
| B9FB | NEG | Negate A. | ||
| B9FD | LD (IX+$09),A | Write A to offset 09 of IX. | ||
| BA00 | LD (IX+$08),$00 | Store 00 at offset 08 of IX. | ||
| BA04 | LD (IX+$0A),$00 | Store 00 at offset 0A of IX. | ||
| BA08 | RET | Return. | ||
| BA09 | NOP | Do nothing. | ||
| BA0A | NOP | Do nothing. | ||
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