Chase H.Q.: Routine at 8A36

8A36: Sound effect - "bip-bow"

Input
D	Delay at start
E	Same as D

sfx_bipbow

8A36

LD C,$14

C = 20

8A38

LD HL,$0505

Inner loop counter. H is decremented and restored from L each loop.

sfx_bipbow_loop

8A3B

DEC D

Delay loop of D iterations

8A3C

JR NZ,sfx_bipbow_loop

8A3E

LD D,E

D = E

8A3F

LD A,$18

Delay loop of (24 - C) iterations

8A41

SUB C

8A42

LD B,A

sfx_bipbow_0

8A43

DJNZ sfx_bipbow_0

8A45

LD A,$18

A = 24 set EAR and MIC bits <not sure of the effect>

8A47

OUT ($FE),A

Output A

8A49

LD B,C

Delay loop of C iterations

sfx_bipbow_1

8A4A

DJNZ sfx_bipbow_1

8A4C

XOR A

Output 0

8A4D

OUT ($FE),A

8A4F

DEC H

Loop while H > 0

8A50

JR NZ,sfx_bipbow_loop

8A52

LD H,L

H = L

8A53

DEC C

Loop while C > 0

8A54

JR NZ,sfx_bipbow_loop

This entry point is used by the routine at start_siren_hook.

sfx_bipbow_2

8A56

RET

Return