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Routines |
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Handler for the object type 138 a sound object. Byte 1 of the object is a count, which it decreases. When the count reaches zero the object is removed. Until then it plays a tone of as many cycles as the count, with a half period that is made from the count rotated left three times, inverted and exclusive ORed with 64. No object of this type is ever created (see Unused_Start_Sound_Object_8A), so the game never plays this sound.
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| SoundEffectNext | 41157 | DEC (IX+1) | Decrease the count of the sound and jump to ClearSound if it has run out. | |||||
| 41160 | JR Z,ClearSound | |||||||
| 41162 | LD A,(IX+1) | Fetch the count of the sound. | ||||||
| 41165 | LD C,A | Use it as the number of cycles. | ||||||
| 41166 | RLCA | Rotate the count left three times. | ||||||
| 41167 | RLCA | |||||||
| 41168 | RLCA | |||||||
| 41169 | CPL | Invert the bits. | ||||||
| 41170 | XOR %01000000 | Flip bit 6 to make the half period. | ||||||
| 41172 | LD B,A | Store the half period in B. | ||||||
| 41173 | JP SoundsBeep | Jump to SoundsBeep to play the tone. | ||||||
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View the equivalent code in;
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