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F66C: Play Wave #2
Input
BC Delay
DE Duration
PlayWave2 F66C PUSH BC Stash the delay counter on the stack twice.
F66D PUSH BC
F66E CALL Delay_Loop Call Delay_Loop.
F671 LD BC,$FFFE Send *Active_BorderColour to the speaker port.
F674 LD A,($5BD0)
F677 OUT (C),A
F679 POP BC Restore the delay counter from the stack.
F67A CALL Delay_Loop Call Delay_Loop.
F67D LD BC,$FFFE BC=FFFE (C points to the speaker port).
F680 LD A,($5BD0) A=*Active_BorderColour.
F683 OR %00010000 Turn on the speaker (set bit 4).
F685 OUT (C),A Send A to the speaker port.
F687 POP BC Restore the delay counter from the stack.
F688 INC BC Increment the delay counter by one.
F689 DEC DE Decrease the duration counter by one.
F68A LD A,E Keep looping back to PlayWave2 until the duration counter is zero.
F68B OR D
F68C JR NZ,PlayWave2
F68E RET Return.
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