ASINX:
CJNE 	R4,#78H,$+3				
JC 		DON6				
MOV 	A,R5
RLC 	A
MOV 	79H,C					
ANL 	0DH,#7FH					
LCALL 	G1
LCALL 	FPCP
JZ    	AA
JC    	AA1
LJMP  	0FFFFH					
AA:
ACALL 	GHPI
ACALL 	EX
SJMP  	PP2;|x|=1,arcsin x=±π/2
AA1:
CLR 	7DH;|x|<0.5標志
CJNE 	R4,#80H,AS1;|x|≤0.5
MOV 	A,R5
ORL 	A,R6
ORL 	A,R7
JZ  		AS1						
SETB 	7DH						
CLR 	A
CLR 	C
SUBB 	A,R7
MOV 	R7,A
CLR 	A
SUBB 	A,R6
MOV 	R6,A
CLR 	A 
SUBB 	A,R5
ADD 	A,#80H
MOV 	R5,A
MOV 	R4,#7FH					
NRMLP:
ACALL 	SHIF
DEC 	R4
MOV 	A,R5
JNB 		ACC.7,NRMLP
ACALL 	FPS0						
AS1:
ACALL 	FPLN1					
DB 	7AH,3DH,43H,0C4H;0.115 518 01 E-1
DB 	7AH,64H,0CCH,0CDH;0.139 648 44 E-1
DB 	7BH,0EH,27H,62H;0.173 527 64 E-1
DB 	7BH,37H,45H,0D1H;0.223 722 59 E-1
DB 	7BH,78H,0E3H,8EH;0.303 819 44 E-1
DB 	7CH,36H,0DBH,6EH;0.446 428 57 E-1
DB 	7DH,19H,99H,9AH;0.075
DB 	7EH,2AH,0AAH,0AAH;0.166 666 67
DB 	81H,0,0,0;1
DB 1								
JNB 		7DH,PP20					
INC 		R4
JNB 		7FH,AS2
JNB 		79H,ACSRT 				
ACALL 	GHPI
INC  	R0
SJMP	AS3  					
AS2:
ACALL 	GHPI					
ACALL 	FPSU					
PP20:
AJMP 	PP2