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Routines |
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Copy a bit-7-terminated tune from DE into the sound buffer, working downwards from Tune_Buffer_End.
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Copy a bit-7-terminated tune from DE into the buffer.
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| QueueTune | B9BC | DI | Disable interrupts. | |||||
| B9BD | LD HL,$FF51 | HL=Tune_Buffer_End. | ||||||
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Copy bytes until bit 7 marks the terminator.
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| QueueTune_Copy | B9C0 | LD A,(DE) | A=*DE. | |||||
| B9C1 | INC DE | Increment DE by one. | ||||||
| B9C2 | BIT 7,A | Jump to QueueTune_Terminator if bit 7 of A is set. | ||||||
| B9C4 | JR NZ,QueueTune_Terminator | |||||||
| B9C6 | LD (HL),A | Write A to *HL. | ||||||
| B9C7 | DEC HL | Decrease HL by one. | ||||||
| B9C8 | JR QueueTune_Copy | Jump to QueueTune_Copy. | ||||||
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Store the terminator byte with bit 7 cleared.
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| QueueTune_Terminator | B9CA | AND %01111111 | Keep only bits 0-6. | |||||
| B9CC | LD (HL),A | Write A to *HL. | ||||||
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Save the buffer pointer and enable interrupts.
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| B9CD | LD ($FF54),HL | Write HL to Tune_Pointer. | ||||||
| B9D0 | EI | Enable interrupts. | ||||||
| B9D1 | RET | Return. | ||||||
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