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Routines |
| Prev: D682 | Up: Map | Next: D6DB |
| D68C | LD B,$03 | Set B the number of channels to play | ||
| D68E | LD IX,$D832 | Set IX to address for channel #1 sound data | ||
| D692 | LD D,$00 | Set sound register for fine pitch on channel #1 | ||
| D694 | LD A,$01 | Set channel volume #1 | ||
| D696 | LD ($D857),A | |||
| D699 | PUSH BC | Save BC and DE | ||
| D69A | PUSH DE | |||
| D69B | CALL $D6DB | Configure next tone/noise data for current channel | ||
| D69E | POP DE | |||
| D69F | PUSH DE | |||
| D6A0 | LD A,(IX+$00) | Jump to next channel if this channel is disabled | ||
| D6A3 | CP $FF | |||
| D6A5 | JP Z,$D6C8 | |||
| D6A8 | LD A,(IX+$06) | Jump forward if noise sound | ||
| D6AB | CP $00 | |||
| D6AD | JP NZ,$D6C0 | |||
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play note
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| D6B0 | LD E,(IX+$04) | Send command for fine pitch | ||
| D6B3 | CALL $D759 | |||
| D6B6 | INC D | Increase register number | ||
| D6B7 | LD E,(IX+$05) | Send command for coarse pitch | ||
| D6BA | CALL $D759 | |||
| D6BD | JP $D6C8 | Jump forward and play next channel | ||
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play noise
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| D6C0 | LD E,(IX+$04) | Send command for noise pitch | ||
| D6C3 | LD D,$06 | |||
| D6C5 | CALL $D759 | |||
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play next channel
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| D6C8 | LD BC,$0008 | Point IX to the next channel data buffer | ||
| D6CB | ADD IX,BC | |||
| D6CD | POP DE | Restore DE and BC | ||
| D6CE | POP BC | |||
| D6CF | INC D | Increment register for next channel | ||
| D6D0 | INC D | |||
| D6D1 | LD A,($D857) | Increment volume channel | ||
| D6D4 | INC A | |||
| D6D5 | LD ($D857),A | |||
| D6D8 | DJNZ $D699 | Jump back and play next channel | ||
| D6DA | RET | |||
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