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Routines |
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Used by the routine at Check_Sabreman_Contact.
Plays 8 tones of one cycle each. The half period of each tone depends on the y position of the object: it is made from the counter added to the y position, keeping the low four bits, inverted and rotated left.
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| Play_Position_Sound | 41205 | LD D,8 | Set the number of tones to 8. | |||||
| Play_Position_Sound_Loop | 41207 | LD A,D | Fetch the tone counter. | |||||
| 41208 | ADD A,(IX+3) | Add the y position of the object, so that the pitch depends on its position. | ||||||
| 41211 | AND %00001111 | Keep only the low four bits. | ||||||
| 41213 | CPL | Invert the bits. | ||||||
| 41214 | RLCA | Rotate the result left. | ||||||
| 41215 | LD B,A | Use the result as the half period. | ||||||
| 41216 | CALL SoundsClick | Play the tone. | ||||||
| 41219 | DEC D | Decrease the tone counter and loop back until all of the tones have been played. | ||||||
| 41220 | JR NZ,Play_Position_Sound_Loop | |||||||
| 41222 | RET | Return. | ||||||
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