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Routines |
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Used by the routines at HandleRemoteControlRobot and HandleChasingDome.
Plays the sound of a moving robot. The length comes from a table of four values, using bits 0 and 1 of FrameCounter, and the pitch changes with the frame.
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Fetch a length from the table.
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| PlayMovingSound | B690 | LD A,($5B02) | Fetch FrameCounter. | |||||
| B693 | AND %00000011 | Keep only bits 0 and 1. | ||||||
| B695 | CALL AddAToHL | Call AddAToHL. | ||||||
| B698 | LD C,(HL) | Fetch the length of the sound. | ||||||
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Play a beep of a pitch made from the frame and the length.
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| PlayMovingSound_NextBeep | B699 | LD A,($5B02) | Fetch FrameCounter. | |||||
| B69C | XOR C | Combine it with the length. | ||||||
| B69D | AND %00011111 | Keep only bits 0 to 4. | ||||||
| B69F | OR %01000000 | Set bit 6. | ||||||
| B6A1 | LD B,A | Keep the pitch in B. | ||||||
| B6A2 | CALL PlaySquareWave | Call PlaySquareWave. | ||||||
| B6A5 | DEC C | Count down. | ||||||
| B6A6 | JR NZ,PlayMovingSound_NextBeep | Jump to PlayMovingSound_NextBeep until all of the beeps have been played. | ||||||
| B6A8 | RET | Return. | ||||||
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