Routines
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43463: Handle Remote Control Robot
The update routine for the remote control robot (objects 124 to 127). The pads at HandleRemoteControlArrow and HandleRemoteControlBlock leave a command in RemoteControlCommand: bit 7 says a robot is listening, and bits 0 to 5 hold the command. The first robot to be updated claims bit 7 of RemoteControlCommand and bit 7 of IX+16. When a command arrives it sets bit 6 instead and follows the pad until it is released.
Input
IX The address of the object
See whether this robot is listening or following.
HandleRemoteControlRobot 43463 CALL SetPixelAdjustments Call SetPixelAdjustments.
43466 LD HL,23362 Point HL at RemoteControlCommand.
43469 LD A,(HL) Fetch the command.
43470 AND %10000000 Keep bit 7.
43472 JR Z,HandleRemoteControlRobot_BecomeListener Jump to HandleRemoteControlRobot_BecomeListener if no robot is listening.
43474 LD A,(IX+16) Fetch the state of this robot.
43477 AND %11000000 Keep bits 6 and 7.
43479 JR Z,HandleRemoteControlRobot_Move Jump to HandleRemoteControlRobot_Move if this robot is neither.
43481 BIT 7,(IX+16) Jump to HandleRemoteControlRobot_Listening if this robot is listening.
43485 JR NZ,HandleRemoteControlRobot_Listening
This robot is following the pad.
43487 LD A,(HL) Fetch the command.
43488 AND %00111111 Keep bits 0 to 5.
43490 JR NZ,HandleRemoteControlRobot_CarryOutCommand Jump to HandleRemoteControlRobot_CarryOutCommand if there is a command.
43492 RES 7,(HL) Reset bit 7 of RemoteControlCommand.
43494 RES 6,(IX+16) Reset bit 6 of the state.
43498 XOR A Write 0.
43499 LD (IX+9),A Stop the speed along the x axis.
43502 LD (IX+10),A Stop the speed along the y axis.
Move the robot and redraw it if it is moving.
HandleRemoteControlRobot_Move 43505 CALL ApplyGravityAndMove Call ApplyGravityAndMove.
43508 CALL TestObjectMoving Return if the robot is not moving.
43511 RET Z
43512 CALL PlaySoundFromHeight Call PlaySoundFromHeight.
43515 JP SetWipeAndDrawFlags Jump to SetWipeAndDrawFlags.
Make this robot the listener.
HandleRemoteControlRobot_BecomeListener 43518 SET 7,(HL) Set bit 7 of RemoteControlCommand.
43520 SET 7,(IX+16) Set bit 7 of the state.
43524 JR HandleRemoteControlRobot_Move Jump to HandleRemoteControlRobot_Move.
This robot is listening.
HandleRemoteControlRobot_Listening 43526 LD A,(HL) Fetch the command.
43527 AND %01111111 Keep bits 0 to 6.
43529 JR Z,HandleRemoteControlRobot_Move Jump to HandleRemoteControlRobot_Move if there is no command.
43531 LD A,(IX+16) Fetch the state of this robot.
43534 AND %00111111 Keep bits 0 to 5.
43536 OR %01000000 Set bit 6.
43538 LD (IX+16),A Store the state.
Carry out a command from RemoteControlRobotSpeeds.
HandleRemoteControlRobot_CarryOutCommand 43541 LD A,(HL) Fetch the command.
43542 LD (HL),128 Set RemoteControlCommand to 128.
43544 DEC A Take one off the command.
43545 RLCA Double it.
43546 AND %01111110 Keep bits 1 to 6.
43548 LD HL,43587 Point HL at RemoteControlRobotSpeeds.
43551 CALL AddAToHL Call AddAToHL.
43554 LD A,(HL) Fetch the speed along the x axis.
43555 INC HL Move on to the speed along the y axis.
43556 LD (IX+9),A Set the speed along the x axis.
43559 LD A,(HL) Fetch the speed along the y axis.
43560 DEC HL Move HL back.
43561 LD (IX+10),A Set the speed along the y axis.
43564 CALL NextSpriteNumber Call NextSpriteNumber.
43567 LD A,(IX+9) Jump to HandleRemoteControlRobot_PlaySound if the robot is not moving.
43570 OR (IX+10)
43573 JR Z,HandleRemoteControlRobot_PlaySound
43575 CALL ApplyGravityAndMove Call ApplyGravityAndMove.
HandleRemoteControlRobot_PlaySound 43578 LD HL,46761 Point HL at MovingSoundLengths.
43581 CALL PlayMovingSound Call PlayMovingSound.
43584 JP SetWipeAndDrawFlags Jump to SetWipeAndDrawFlags.
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