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Routines |
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Used by the routine at EnterDoor.
Sets the velocities of the player (offsets 06 and 07) from bits 6-7 of the attribute of a door, using DoorVelocities. This is done by EnterDoor so that the player moves out of the door.
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| SetPlayerVelocity | 986A | LD A,(IX+$05) | Fetch the attribute of the door. | |||||
| 986D | RLCA | Rotate A left three times. | ||||||
| 986E | RLCA | |||||||
| 986F | RLCA | |||||||
| 9870 | AND %00000110 | Keep only bits 1-2, which were bits 6-7. | ||||||
| 9872 | LD C,A | Keep the velocity index in C. | ||||||
| 9873 | LD B,$00 | B=00. | ||||||
| 9875 | LD HL,$9883 | Point HL at the door velocities at DoorVelocities. | ||||||
| 9878 | ADD HL,BC | Find the velocities for the door in the table. | ||||||
| 9879 | LD A,(HL) | Fetch the X velocity. | ||||||
| 987A | INC HL | Move HL on to the next byte. | ||||||
| 987B | LD ($EA96),A | Update the X velocity of the player (offset 06). | ||||||
| 987E | LD A,(HL) | Fetch the Y velocity. | ||||||
| 987F | LD ($EA97),A | Update the Y velocity of the player (offset 07). | ||||||
| 9882 | RET | Return. | ||||||
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