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Routines |
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The update routine for the remote control arrows (objects 7A and 7B). Object 7A is west, or north when flipped; object 7B is east, or south when flipped, giving commands 02 to 05.
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Send a direction if something has landed.
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| HandleRemoteControlArrow | AA63 | CALL SetPixelAdjustments | Call SetPixelAdjustments. | |||||
| AA66 | LD A,(IX+$0B) | Fetch the vertical speed. | ||||||
| AA69 | AND A | Return if nothing has landed. | ||||||
| AA6A | RET Z | |||||||
| AA6B | XOR A | Write 00 to the vertical speed. | ||||||
| AA6C | LD (IX+$0B),A | |||||||
| AA6F | LD A,(IX+$07) | Fetch the flags of the pad. | ||||||
| AA72 | RLCA | Move the flip into bit 7. | ||||||
| AA73 | AND %10000000 | Keep bit 7. | ||||||
| AA75 | LD C,A | Keep it in C. | ||||||
| AA76 | LD A,(IX+$00) | Fetch the sprite number. | ||||||
| AA79 | AND %00000001 | Keep bit 0. | ||||||
| AA7B | OR C | Combine it with the flip. | ||||||
| AA7C | RLCA | Move the bits into a command. | ||||||
| AA7D | ADD A,$02 | Add 02. | ||||||
| AA7F | LD C,A | Keep the command in C. | ||||||
| AA80 | LD HL,$5B42 | Point HL at RemoteControlCommand. | ||||||
| AA83 | LD A,(HL) | Fetch the command. | ||||||
| AA84 | AND %10000000 | Keep bit 7. | ||||||
| AA86 | OR C | Combine it with the new command. | ||||||
| AA87 | LD (HL),A | Set RemoteControlCommand. | ||||||
| AA88 | RET | Return. | ||||||
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