本人初学者，希望大神们帮我把这个代码标上注释，谢谢..
ORG 0000H
AJMP MAIN
ORG 0013H
LJMP IN1
ORG 0030H
MAIN：MOV SP，#60H
MOV P1，#0FH
SETB P1.4
SETB EA
SETB EX1
MOV 5AH，#0
MOV 5BH，#2
MOV 5CH，#5
MOV 5DH，#0
MOV 28H，#0
MOV TCON，#05H
MOV 29H，#01H
MOV 35H，#10
MOV 37H，#10
LOOP：MOV A，35H
CJNE A，#1，NEXT
LJMP N1
NEXT：LCALL AD
MOV R2，#0
MOV R3，40H
LCALL Q1
MOV 3AH，R2
MOV 3BH，R3
LCALL BJ
LCALL DIR
LCALL TIM
LJMP LOOP
NI：LCALL SD
N4：MOV A，35H
CJNE A，#2，N2
MOV A，R4
ADD A，#1
MOV 52H，A
CLR C
MOV A，R4
SUBB A，#1
MOV 53H，A
MOV A，31H
MOV 5AH，A
MOV A，32H
MOV 5BH，A
MOV A，33H
MOV 5CH，A
MOV A，34H
MOV 5DH，A
RET
IN1：PUSH PSW
PUSH ACC
CLR EX1
MOV A，P1
RRC A
JC M1
MOV 35H，#1
LJMP TT
M1：RRC A
JC M2
MOV 35H，#2
MOV A，28H
SETB ACC.0
MOV 28H，A
LJMP TT
M2：RRC A
JC M3
MOV 35H，#3
MOV A，28H
SETB ACC.0
MOV 28H，A
LJMP TT
M3：RRC A
JC TT
MOV 35H，#4
TT：NOP
POP ACC
POP PSW
SETB EX1
RETI
AD1：MOV A，37H
ANL A，#0FH
ORL A，#30H
MOV R1, A
MOV A，@R1
INC A
MOV B，#10
div AB
MOV A，B
MOV @R1，A
RET
IDB:MOV 30H，#0
MOV R0,#30H
MOV R2,#3
MOV R3,#0
MOV A,@R0
MOV R4,A
LP:MOV A,R4
MOV B,#10
MUL AB
MOV R4,A
MOV A,#10
XCH A,B
XCH A,R3
MUL AB
ADD A,R3
XCH A,R4
INC R0
ADD A,@R0
XCH A,R4
ADDC A,#0
MOV R3,A
DJNZ R2,LP
RET
BJ:MOV 30H,#0
MOV A,40H
CLR C
SUBB A,52H
JC XX
SETB P1.4
RET
XX:MOV A,40H
CLR C
SUBB A,53H
JNC WW
CLR P1.4
WW:RET
Q1:MOV DPTR,#TABLE
MOV A,R3
CLR C
RLC A
MOV R3,A
XCH A,R2
RLC A
XCH A,R2
ADD A,DPL
MOV DPL,A
MOV A,DPH
ADDC A,R2
MOV DPH,A
CLR A
MOVC A,@A+DPTR
MOV R2,A
CLR A
INC DPTR
MOVC A,@A+DPTR
MOV R3,A
RET
TABLE: DW 000，045，051，056，062，066
DW 070,074,081,086,092
DW 098,100,105,110,116
DW 121,124,130,135,138
DW 142,146,151,154,160
DW 165,168,170,175,178
DW 180,184,190,193,195
DW 208,214,220,224,229
DW 232,238,242,250,255
DW 260,264,271,275,280
DW 284,292,294,295,300
DW 306,311,316,321,325
DW 330,334,338,343,347
DW 350,355,360,362,364
DW 366,368,370,375,376
DW 378,379,380,382,384
DW 385,387,388,389,390
DW 392,395,396,399,400
DW 402,403,405,406,408
DW 410,412,414,416,418
DW 419,420,422,423,425
DW 427,428,430,432,436
DW 438,439,440,442,444
DW 445,446,449,450,452
DW 438,440,442,446,448
DW 450,452,453,455,456
DW 458,461,463,465,468
DW 468,470,472,475,478
DW 480,480,482,485,485
DW 488,490,491,493,495
DW 498,500,500,501,504
DW 505,508,510,512,515
DW 518,518,522,524,528
DW 532,536,540,540,545
DW 548,549,551,554,556
DW 559,560,562,565,568
DW 570,572,573,575,578
DW 580,583,585,588,590
DW 595,596,598,600,602
DW 608,610,610,612,615
DW 620,623,625,628,630
DW 632,635,640,642,645
DW 648,650,652,655,658
DW 660,664,665,668,672
DW 675,677,680,685,688
DW 690,695,700,705,710
DW 712,715,718,720,725
DW 769,773,775,780,782
DW 810,815,818,820
Ndiv1：MOV A,R3
CLR C
SUBB A,R7
MOV A,R2
SUBB A,R6
JNC NDVE1
MOV B,#16
NDVL1:CLR C
MOV A,R5
RLC A
MOV R5,A
MOV A,R4
RLC A
MOV R4,A
MOV A,R3
RLC A
MOV R3,A
XCH A,R2
RLC A
XCH A,R2
MOV F0,C
CLR C
SUBB A,R7
MOV R1,A
MOV A,R2
SUBB A,R6
JB F0,NDVM1
JC NDVD1
NDVM1:MOV R2,A
MOV A,R1
MOV R3,A
INC R5
NDVD1:DJNZ B,NDVL1
CLR F0
RET
NDVE1:SETB F0
RET
自己对照着慢慢一点一点的写注释。这种工作，别人不可能帮你的。