Routines
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FCE4: Make a sound effect
Used by the routines at 7565 (to make the cash bonus/key sound effect) and FC6A (to make the sound effect for when Sam hits the ground after being dropped by a gangster).
Input
A Border colour
C Pitch
DE Duration
FCE4 XOR $10 Flip bit 4 of A (the speaker bit)
FCE6 OUT ($FE),A Set the border colour and change the speaker state
FCE8 LD B,C Perform the pitch delay
FCE9 DJNZ $FCE9
FCEB DEC E Jump back until the sound effect is finished
FCEC JR NZ,$FCE4
FCEE DEC D
FCEF JR NZ,$FCE4
FCF1 RET
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