Stormbringer (48k): Routine at 47946

47946: Play hiss-type sound

Used by the routines at 64207 and 64230.
47946	CALL 48018
47949	EX AF,AF'
47950	LD H,0
47952	LD BC,128
47955	EX AF,AF'
47956	OUT (254),A
47958	XOR 16
47960	EX AF,AF'
47961	LD L,0
47963	LD D,L
47964	LD E,H
47965	AND A
47966	SBC HL,DE
47968	SBC HL,DE
47970	LD DE,254
47973	ADD HL,DE
47974	LD A,L
47975	SUB H
47976	JR C,47979
47978	DEC A
47979	LD H,A
47980	DEC A
47981	JR NZ,47980
47983	DEC BC
47984	LD A,B
47985	OR C
47986	JR NZ,47955
47988	RET