Routines
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C435: Play Random Sound
Used by the routine at UpdateBurst.
Plays sixteen tones with pitches taken from a random place in the ROM, if the object at IX has been drawn in the view (bit 1 of its flags).
Input
IX Object
PlayRandomSound C435 BIT 1,(IX+$07) Return if the object has not been drawn in the view, otherwise clear the flag.
C439 RES 1,(IX+$07)
C43D RET Z
C43E LD HL,($BBAA) Fetch the random number.
C441 LD A,H Turn it into the address of a random place in the first 2000 bytes of the ROM.
C442 AND $1F
C444 LD H,A
C445 LD E,$10 Set a counter for sixteen tones.
PlayRandomSound_Loop C447 LD A,(HL) Play a short tone, with a pitch taken from the ROM, and loop back until all sixteen tones have been played.
C448 INC HL
C449 AND $7F
C44B LD B,A
C44C LD C,$01
C44E CALL PlayTone
C451 DEC E
C452 JR NZ,PlayRandomSound_Loop
C454 RET Return.
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