PowerPoint Template
[email protected]
[email protected]@mail.xidian.edu.cn1.
[email protected] 1234I/O5()1Reg2 3 4 5
[email protected]@mail.xidian.edu.cn61.1 7
()1~4[] [][] ()1321.1.1 8(1): A~Z, a~z; : 0~9; : ? . @ _ $ . 31,
9(2) 8086/8088 (3) RET COUNT INC CX MOV CXDI ADD AX[BP4] (4) 101 /
ANDORLT MOV AX, [DI+BX] ADD AX, FIRST+1MOV AX, ((choice LT 20) AND
5) OR ((choice GE 20) AND 6 )
1.1.2 11+, -122 1) $$BLOCK DB HELLO!NUM EQU
$-BLOCKHELLO!BLOCK$;NUM 613SEG OFFSETSEG: OFFSET: SLOT DW 25MOV
AXSLOT SLOTAX MOV AXSEG SLOT SLOTAX MOV AXOFFSET SLOT SLOTAX 143)
TYPE 3-1 NEAR FAR 1 2 4 1 2
154) LENGTH SIZEDUPLENGTH: SIZE
SIZE=LENGTH TYPE MULT-WORD DW 50 DUP0 LENGTH MULT-WORD=50 SIZE
MULT-WORD=100 TYPE MULT-WORD=2163 1) PTR PTR F2 DW 3456HMOV AL,
BYTE PTR F2MOV [BX], 3MOV BYTE PTR [BX], 3; AL: 56H; ; 171.1.3 181
(B)(Q)(H)(D)()100 01100100B 244Q 64HBD This is a classroom.192
COUNT EQU 10 NAME=J ASCII 203 21(SEG) (OFFSET) ()(TYPE) DB(1) DW(2)
DD(4) NEARFAR 22DATA SEGMENT X DB 5, 4 Y DW 40H Z DD 2030HDATA
ENDS05H04H40H00H30H20H00H00HDS:0000HXYZX,Y,Z234 , PORTVAL1 OFFSET
SUM SEG SUMTYPE CYCLE 245 SUM2CYCLE5 SUM2CYCLE5SUMCYCLESUMCYCLE25
251.1.4 26.ASM.OBJ.EXE MASM.EXE LINK.EXE1)2)3)4)
27DOSDOS28.EXEROM00000HDS,ES100SSFFFFFHCS30INT 20H
RETROMDS,ESSSCSDS,ESCPUPSP PUSH DS MOV AX, 0 PUSH
AXDS0000HRETPSP0000HCSIPDOSINT 20H00H00HPSPLPSPH314CH) MOV AH, 4CH
INT 21HDOS
321.2 33CPUCPU 341.2.1 DBBUFFER DB 2, 3STRING DB
NOON03H02HBUFFERDWBUF DW 2, 3, 505H00H00H03H00H02HBUFSTRINGDD:
4DQ4DT1035? n DUP( )nARRAY DB 100 DUP(?)100ARRAY100DATA1 DB 100
DUP(AB)20010041H, 42H41H 42H 41H 42H 41H 42H36VAL DB 14 DUP (5, 2
DUP(FFH, 0 ))VAL101,5,FFH,0,FFH,0,5,FFH,0,FFH DW 1, 2, 5 DUP(YES,2
DUP(3)), 371.2.2 EQU = EQUPURGEPURGE TIMES TIMES EQU 100TIMES EQU
50BUF DB TIMES DUP(?)BUF DB 50 DUP(?)BETA = TIMES-2BETA = TIMES+5
;38DATA SEGMENT A DW 3 B DW 4 L EQU B-ADATA
ENDS03H00H04H00HDS:0000HL2391.2.3
SEGMENTENDS4CodeDataStackExtraENDS SEGMENT [] [] []
ENDS401)2),,,,256(PAGE)**** **** **** 0000 000016***00H (256)
(256)00000H000FFH00100H00200H001FFH4116(PARA)**** **** **** ****
000016****0H
(16)
(16)***00H***0FH***10H***1FH***20H()422(WORD)(BYTE)(PAGE)(PARA)****0HBYTE:
WORD: ;PARA: ();PAGE: 433)NONE: PUBLIC44COMMON: COMMONSTACK:
STACKSTACKSSSPSSSP145MEMORY: AT: 464) (CODE)(DATA)(STACK)()471.2.4
ASSUMEASSUME : [: ] CODE SEGMENT ASSUME CSCODEDSDATASSSTACK 48
DOSCSSSDSDSMOVES CODE SEGMENT ASSUME CSCODEDSDATASSSTACK MOV AXDATA
DATAAX MOV DSAX AXDSDS CODE ENDS 491.2.5 PROCENDP () PROCENDP PROC
[] RET ENDP PROCENDP FARNEAR RET 50MYCODE SEGMENTASSUME CS:
MYCODESUB1 PROC FAR RETSUB1 ENDPSUB2 PROC NEAR RETSUB2 ENDPCALL
SUB2MYCODE ENDSFAR: CSIPNEAR: IP()CALL: SUB251100msDELAY PROC MOV
BL, 10AGAIN: MOV CX, 2801HWAIT1: LOOP WAIT1 DEC BL JNZ AGAIN
RETDELAY ENDP521.2.6 531) MACRO ()ENDMMACRO ENDMSHIFT MACRO MOV CL,
4 SAL AL, CLENDM: AL4(16)IN AL, 5FHSHIFTOUT 5FH, AL54XYSHIFT MACRO
X, Y MOV CL, Y SAL X, CLENDMMOV BX, WORD PTR BUFSHIFT BX, 4MOV WORD
PTR BUF , BXBX4BXX4Y551.2.7 ORG CODE SEGMENT ORG 0100H MOV AX,
0CODE ENDSMOV0100HDATA SEGMENT ORG 2000H NUM DB 05DATA
ENDSNUM2000H561.2.8 ENDENDEND [email protected] 1DATA
SEGMENT X DB 3 Y DB 5DATA ENDSSTACK SEGMENT STACK STACK DB 100
DUP(?)STACK ENDSCODE SEGMENT ASSUME CS:CODE, DS: DATA, SS:STACK
BEGIN MOV AX, DATA MOV DS, AX MOV AH,4CH INT 21H CODE ENDS END
BEGINDS(DOS59 2DATA SEGMENT X DB 3 Y DB 5DATA ENDSSTACK SEGMENT
STACK STACK DB 100 DUP(?)STACK ENDSCODE SEGMENT ASSUME CS:CODE, DS:
DATA, SS:STACK BEGIN PROC FAR PUSH DS XOR AX, AX PUSH AX MOV AX,
DATA MOV DS, AX RET BEGIN ENDPCODE ENDSEND
BEGINPSPDOSDS([email protected] 1myfileasm
2myfileasmMASM TASMmyfileobj3myfileobjLINK
[email protected] CPUASM
myfileasmxtwang@mail.xidian.edu.cn622.MASM.MASMmyfileobjmyfilelstmyfilecrf
[email protected] MASM
sourceobjectlistcrossrefsource : object : list : crossref
MASM myfilemyfileobjMASM myfileMASM myfilelist
[email protected](.lib)(.exe)(.map)
LINK object.exeLINK object [email protected]
MASM
DEBUG
[email protected]/[email protected]
DEBUG [d:][path][.]DEBUGDEBUG-d:path.exemyfile.exe: DEBUG
[email protected]. DEBUGR4.2
PSW8OFDFIFSFZFAFPFCF4.34.2
2.xtwang@mail.xidian.edu.cn10OFOVNVDFDNUPIFEIDISFNGPLZFZRNZAFACNAPFPEPOCFCYNC2.xtwang@mail.xidian.edu.cn3.
AXR R AXDEBUGAXAX 0000 [email protected]. R R FNV UP EI
PL NZ NA PO NC - [email protected]. U1U
CSIP32U2U addraddr3U addr1addr2
[email protected]. GG1G CSIP2Gaddr
addr3Gaddr1addr21addr12addr224G addr CSIPaddraddr
[email protected].
D
E
F
[email protected]
[Daddr]Offset128DaddrDSDSESCSSSOffset2D128DS03D [Daddr]Offset1
Offset21Offset12Offset2 [email protected]
[Daddr]OffsetE2E [Daddr]Offset Expression; ExpressionE100 10 20 30
40 50DS100H510H 20H 30H 40H [email protected]
[Daddr]Offset1 Offset2 ExpressionExpression1Offset12Offset2F100 200
55 AADS100H200H55HAAH2F [Daddr]Offset L length
ExpressionExpressionOffsetlengthF100L100 55
[email protected]
[Daddr]Offset1 Offset2 Offset31Offset12Offset2Offset3M100 200
300DS100H200H300H2M [Daddr]Offset1 L length
[email protected]
DEBUGTPRTPTPCALL subINT
[email protected]
[Daddr]OffsetOffsetDEBUGA2AACSIP
[email protected] [path] file fileL1L
[Daddr]OffsetOffset2L CS100HBXCX32BX16CX16
[email protected] [Daddr]Offset
[email protected]
[email protected]
[email protected] You
[email protected]
[email protected]
[email protected]@mail.xidian.edu.cnIP4-1INDATn0
n 9 INSTR88D
[email protected] SEGMENT ;INDAT DB 8DATA ENDSCODE
SEGMENT ; ASSUME CS:CODE,DS:DATASTART: MOV AX,DATA MOV DS,AX
;DS
MOV DL,INDAT OR DL,30H MOV AH 2 INT 21H MOV DL,'D' MOV AH,2 INT
21H
MOV AH,4CH INT 21H CODE ENDS END
[email protected]
PSW-128+127 [email protected]
1CMP AL, BL; JZ LABEL JMP OVER LABEL: MOV AH 00H ..OVER:2
LABEL: DEC BL; JZ LABEL OVER:
[email protected]
CMP AL, BL; JZ LABEL ,A MOV AH 0FFH B ..JMP OVER LABEL: MOV AH
00H OVER: .
[email protected]
CMP AL, BL; JAE LAB1 LAB1 MOV AH, 0FFH AJMP OVER LAB1: JZ LAB2;
LAB2 MOV AH, 00H BJMP OVER LAB2: MOV AH, 55H; COVER: .
[email protected] 3.10 4 BX120AL0FFH
TEST BX , 0006HJZ L1 XOR AL, ALJMP L2 L1: MOV AL, 0FFH L2:
[email protected] VAR1VAR2VAR33 VAR1VAR3JAJAEJBJBE
[email protected]
AL VAR2AL VAR3 AL [email protected] SEGMENT STACK
'STACK' DW 100H DUP(?)TOP LABEL WORDSTACK ENDSDATA SEGMENTVAR1DB
46HVAR2DB 15HVAR3DB 0A2HDATA ENDSCODE SEGMENT ASSUME
CS:CODE,DS:DATA, ES:DATA,SS:STACKSTART: MOV AX, DATA MOV DS, AX MOV
ES, AX MOV AX, STACK MOV SS, AX LEA SP,TOP
MOV AL,VAR1 CMP AL,VAR2 JAE NO_CHG1 XCHG AL,VAR2NO_CHG1: CMP
AL,VAR3 JAE NO_CHG2 XCHG AL,VAR3NO_CHG2: MOV VAR1,AL VAR1 MOV
AL,VAR2 CMP AL,VAR3 JAE NO_CHG3 XCHG AL,VAR3 MOV
VAR2,ALVAR2NO_CHG3:
MOV AH,4CHDOS INT 21HCODE ENDS END
[email protected]
[email protected] SEGMENT ; X DW -128 Y DW ?DATA
ENDSCODE SEGMENT ; ASSUME CS:CODE,DS:DATASTART: MOV AX,DATA MOV
DS,AX MOV AX,X CMP AX,0 JG ISPN JZ ISZN MOV Y,-1 JMP FINISHISPN:MOV
Y,1 JMP FINISHISZN:MOV Y,0FINISH:MOV AH,4CHINT 21HCODEENDS END
START
-128+127
[email protected]
162000GREATZZEROLITTLEZJGJGEJLJLEMOVPSW
GREATZZEROLITTLEZ000GREATZ10ZERO10LITTLEZ1xtwang@mail.xidian.edu.cnSTACK
SEGMENT STACK 'STACK' DW 100H DUP(?)TOP LABEL WORDSTACK ENDSDATA
SEGMENTBUFFER DW 500 ;500 X=17 REPT 500 X=(X+979) mod 65535 DW X
ENDMGREATZ DW ?ZERODW ?LITTLEZ DW ?DATA ENDSCODE SEGMENT ASSUME
CS:CODE,DS:DATA,ES:DATA,SS:STACK
[email protected]: MOV AX, DATA MOV DS, AX MOV ES,
AX MOV AX, STACK MOV SS, AX LEA SP,TOP XOR AX,AX MOV GREATZ,AX MOV
ZERO,AX MOV LITTLEZ,AX MOV CX,BUFFER LEA SI,BUFFER+2ST_COUNT:MOV
AX,[SI]ADD SI,2AND AX,AXJLE COUNT1INC GREATZJMP COUNT3
COUNT1:JL COUNT2INC ZEROJMP COUNT3COUNT2:INC LITTLEZCOUNT3: DEC
CX JNZ ST_COUNT MOV AH,4CH INT 21HCODE ENDS END START
OF [email protected]: 1 , 4, 7, 8 ,9
[email protected] 1 23 4 [email protected]
4 - 3 (a) (b)
[email protected] 4 SIDIBX BP : DS SS SIDIBX
[email protected] LEASI, BUFFER MOV AX,
[SI]SIBUFFERSI2XORSI, SIMOV AX, BUFFER[SI]SIBUFFER MOV BX,
BUFFER[SI][email protected] TABLE100 0AAH FLAG1
FLAG0 0AAH 0AAH 0 Flag 1 Flag SITABLE
[email protected] SI, TABLE MOV CX, 100 L1: MOV [SI],
0AAHTEST [SI], 0AAH INC SI INC SI LOOPZ L1 JZ RIGHT MOV FALG, 1 JMP
OVER RIGHT: MOV FLAG, 0 OVER: MOV AH,4CHDOS INT 21HCODE ENDS END
STARTSTACK SEGMENT STACK 'STACK' DW 100H DUP(?)TOP LABEL WORDSTACK
ENDSDATA SEGMENTTABLE DB DUP(100)FLAG DB ?DATA ENDSCODE SEGMENT
ASSUME CS:CODE,DS:DATA, ES:DATA,SS:STACKSTART: MOV AX, DATA MOV DS,
AX MOV ES, AX MOV AX, STACK MOV SS, AX LEA SP,TOP
[email protected] BUFF 308 SUM
0 N SIBUFF [email protected] SI, BUFF XOR CX, CX
XOR AX, AX MOV CL , [SI] INC SI L1:ADD AL, [SI] ADC AH, 0 INC SI
LOOP L1 MOV SUM AX OVER: MOV AH,4CHDOS INT 21HCODE ENDS END
STARTSTACK SEGMENT STACK 'STACK' DW 100H DUP(?)TOP LABEL WORDSTACK
ENDSDATA SEGMENTBUFF DB 30 DB SUM DW ?DATA ENDSCODE SEGMENT ASSUME
CS:CODE,DS:DATA, ES:DATA,SS:STACKSTART: MOV AX, DATA MOV DS, AX MOV
ES, AX MOV AX, STACK MOV SS, AX LEA SP,TOP
[email protected] COUNT MAX N-1 BXARRAY
[email protected] BX, ARRAY MOV CX, COUNT MOV AX,
[BX] DEC CXFINDMAX: JCXZ L1 INC BX INC BX CMP AX, [BX] JA L2 MOV
AX,[BX] L2:LOOP FINDMAX L1: MOV MAX, AX OVER: MOV AH,4CHDOS INT
21HCODE ENDS END STARTSTACK SEGMENT STACK 'STACK' DW 100H DUP(?)TOP
LABEL WORDSTACK ENDSDATA SEGMENTARRAY DW COUNT DW NMAX DW ?DATA
ENDSCODE SEGMENT ASSUME CS:CODE,DS:DATA, ES:DATA,SS:STACKSTART: MOV
AX, DATA MOV DS, AX MOV ES, AX MOV AX, STACK MOV SS, AX LEA
SP,TOP
[email protected]
SOURCE5000FFHDESTINATIONNUMBERSIDI0FFHNUMBER1 N=500STACK SEGMENT
STACK 'STACK' DW 100H DUP(?)TOP LABEL WORDSTACK ENDSDATA
SEGMENTSOURCE LABEL BYTE500 X=17 REPT 500 X=(X+97) mod 256 DB X
ENDMDESTINATIONDB N DUP(?)NUMBERDW ?DATA
[email protected] SEGMENT ASSUME CS:CODE,DS:DATA,
ES:DATA,SS:STACKSTART: MOV AX, DATA MOV DS, AX MOV ES, AX MOV AX,
STACK MOV SS, AX LEA SP,TOP XOR AX,AX MOV NUMBER,AX MOV CX,N LEA
SI,SOURCE LEA DI,DESTINATIONMOVE1:MOV AL,[SI]INC SICMP AL,0FFHJZ
MOVE2MOV [DI],ALINC DIINC NUMBERMOVE2:LOOP MOVE1MOVE_END:MOV
AH,4CHINT 21HCODE ENDS END [email protected]
DATABUF8DATABUF12
NN-1N-1N-1 [email protected] 7 43 36 65 95 81 12 25 12
43 36 65 95 81 25 12 25 43 36 65 95 81 12 25 36 43 65 95 81 . . 12
25 36 43 65 81 95 [email protected] N=100100STACK SEGMENT
STACK STACK DW 100H DUP(?)TOP LABEL WORDSTACK ENDSDATA
SEGMENTDATABUF DW N DB N DUP()DATA ENDSCODE SEGMENT ASSUME
CS:CODE,DS:DATA,ES:DATA,SS:STACK [email protected]:
MOV AX,DATA MOV DS,AX MOV ES,AX MOV AX,STACK MOV SS,AX LEA SP,TOP
DATABUF MOV CXDATABUF LEA SIDATABUF+2 MOV BL23 MOV AL11 LP: MOV
[SI],AL INC SI ADD AL,BL LOOP LP; MOV CX,DATABUF DEC CX LEA
SI,DATABUF2 SI ADD SI,CX SILP1: PUSH CX PUSH
[email protected] LP2: CX MOV AL,[SI] CMP AL,[SI-1] JAE
NOXCHG XCHG AL,[SI-1] MOV [SI],ALNOXCHG: DEC SI LOOP LP2 POP SI POP
CX LOOP LP1 MOV AH,4CH ;DOS INT 21HCODE ENDS END
[email protected] (16)BUF, BUF16BUF 4.4
[email protected] SEGMENT STACK
'STACK' DW 100H DUP(?)TOP LABEL WORDSTACK ENDSDATA SEGMENTBUF DW 20
20DW 1000H,0025H,6730H,6758H,7344H,2023H,0025H,6745H,10A7H,0B612HDW
56AAH,15ACH,5789H,56AAH,6666H,7777H,56AAH,8888H,9999H,1111H DW 10
DUP(?)NEW DW 56AAHNEW56AAHDATA ENDSCODE SEGMENT ASSUME
CS:CODE,DS:DATA,ES:DATA,SS:STACKSTART: MOV AX,DATA MOV DS,AX MOV
ES,AX
[email protected] MOV AX,STACK MOV SS,AX LEA SP,TOP MOV
CX,BUF LEA SI,BUF+2 MOV AX,NEWL1: CMP AX,[SI] JZ L2 INC SI INC SI
LOOP L1MOV [SI],AXINC BUFJMP OKL2: DEC CXINC SIINC SIMOV DI,SI DISI
L3:MOV BX,[SI] INC SIINC SICMP AX,BX JZ L4 MOV [DI],BXINC DIINC
DIJMP L5L4:DEC BUF L5:LOOP L3OK: MOV AH,4CH DOS INT 21H CODE ENDS
END START
[email protected]
DAT1DAT28DATDATM00H10H25H67H68HN00H05H12H26H45HM+N00H05H10H12H25HDAT1DAT2DATSIBXDI3DATDIDAT1DAT2SIBX26H45H67H68Hxtwang@mail.xidian.edu.cn
BXDAT2ALDAT1DATMOVSBDAT2DATSTOSB
[email protected] DAT1DAT28DATDATSTACK SEGMENT STACK
'STACK' DW 100H DUP(?)TOP LABEL WORDSTACK ENDSDATA SEGMENTDAT1 DW
10DAT110 DB 10H,25H,67H,68H,73H,83H,95H,0A8H,0C2H,0E6HDAT2 DW
13DAT213 DB 05,12H,26H,45H,58H,65H,67H,70H,76H,88H,92H,0CDH,0DEHDAT
DW ? DB 200 DUP(?) DATA ENDSCODE SEGMENT ASSUME
CS:CODE,DS:DATA,ES:DATA,SS:STACK DAT1 MOV AL,
[email protected]: MOV AX,DATA MOV DS,AX MOV
ES,AX MOV AX,STACK MOV SS,AX LEA SP,TOP MOV CX,DAT1 CXDAT1 MOV
DX,DAT2 DXDAT2 MOV DAT,CX DAT ADD DAT,DX LEA SI,DAT1+2 SIDAT1 LEA
BX,DAT2+2 BXDAT2 LEA DI,DAT+2 DIDATCLDL1: MOV AL,[BX] INC BX
L2: CMP AL,[SI] JB L3 MOVSBDAT1DAT DEC CX JZ L4 JMP L2L3:
STOSBDAT2DAT DEC DX JZ L5 JMP L1L4: MOV SI,BX DEC SI MOV CX,DXL5:
REP MOVSBDAT1DAT2 DAT MOV AH,4CH DOS INT 21H CODE ENDS END
START
[email protected] 12848
BUFA20019BUFB30029BUFABUFBxBUFCxBUFABUFBBUFCABUFCB55BUFCBUFCABUFCBxBUFCBUFCABUFCBALDLBL
MOV BUFC[DI],ALMOV BUFCA[DI],DLMOV BUFCB[DI],BL MOV
ALBUFA[SI][email protected]
SEGMENT STACK 'STACK' DW 100H DUP(?)TOP LABEL WORDSTACK ENDS N1=20
N2=30DATA SEGMENTBUFA DB
10H,25H,67H,26H,68H,73H,83H,58H,0,06H,12H,0CDH,95H DB
0A8H,0C2H,48H,0E6H,0F1H,1AH,0F5HBUFB DB
05,12H,26H,45H,53H,60H,6AH,7FH,76H,88H,92H,0C1H,0DEH,0E1H,0F5H DB
09,17H,23H,48H,58H,65H,67H,70H,7CH,82H,96H,0CDH,0D1H,0F1H,0FEHBUFC
DB 20 DUP(?)BUFCA DB 20 DUP(?)BUFCB DB 20 DUP(?) DATA ENDSCODE
SEGMENT ASSUME CS:CODE,DS:DATA,ES:DATA,SS:STACK
[email protected]: MOV AX,DATA MOV DS,AX MOV ES,AX
MOV AX,STACK MOV SS,AX LEA SP,TOP MOV CX,N1 XOR SI,SI XOR
DI,DIL1:MOV AL,BUFA[SI]PUSH CXMOV CX,N2XOR BX,BXL2:CMP
AL,BUFB[BX]JZ L3INC BXLOOP L2JMP L4
BUFABUFBL3:MOV BUFC[DI],ALMOV DX,SIMOV BUFCA[DI],DLMOV
BUFCB[DI],BLINC DIL4:POP CXINC SILOOP L1 MOV AH,4CH DOS MOV AL,0
INT 21HCODE ENDS END START [email protected]:10 ,11,
13,[email protected] You
[email protected]
[email protected]
[email protected]@mail.xidian.edu.cn4.5
[email protected] 1 SOFTDLY PROC PUSH BX PUSH CX MOV
BL10 DELAYMOV CX2801 WAIT LOOP WAIT DEC BL JNZ DELAY POP CX POP BX
RET SOFTDLY ENDP
[email protected] 2AX1 COUNT PROC PUSH AX PUSH CX MOV
CX16 XOR BL,BL L1: SHL , AX 1 ADC BL, 0 LOOP L1 POP CX POP AX RET
COUNT ENDP
[email protected] [email protected]
355H
STACK SEGMENT STACK 'STACK' DW 100H DUP(?)TOP LABEL WORDSTACK
ENDSDATA SEGMENTBUF1 DB 10H, DB 23H,32H,55H,34H,98H,55H, DB
43H,55H,97H,64HBUF2 DB ?DATA ENDSCODE SEGMENT ASSUME
CS:CODE,DS:DATA, ES:DATA,SS:STACKSTART: MOV AX, DATA MOV DS, AX MOV
ES, AX MOV AX, STACK MOV SS, AX LEA SP,TOP
CALL COUNT55 MOV AH,4CHDOS INT 21HCOUNT55 PROC NEAR PUSH AX PUSH
CX PUSH BX XOR CX, CX MOV CL, BUF1 MOV AL, 55H MOV BUF2, 0 XOR
BX,BX L1: INC BX CMP BUF1[BX],AL JNZ L2 INC BUF2 L2: LOOP L1POP BX
POP CX POP AX RETCOUNT55 ENDPCODE ENDS END
[email protected] 455H
STACK SEGMENT STACK 'STACK' DW 100H DUP(?)TOP LABEL WORDSTACK
ENDSDATA SEGMENTBUF1 DB 10H, DB 23H,32H,55H,34H,98H,55H, DB
43H,55H,97H,64HBUF2 DB ?DATA ENDSCODE SEGMENT ASSUME
CS:CODE,DS:DATA, ES:DATA,SS:STACKSTART: MOV AX, DATA MOV DS, AX MOV
ES, AX MOV AX, STACK MOV SS, AX LEA SP,TOP LEA SI, BUF1 LEA DI,
BUF2CALL COUNT55 MOV AH,4CHDOS INT 21HCOUNT55 PROC NEAR PUSH AX
PUSH CX PUSH BX XOR CX, CX MOV CL, [SI] MOV AL, 55H MOV [DI], 0 XOR
BX,BX L1: INC BX CMP [BX][SI],AL JNZ L2 INC [DI] L2: LOOP L1POP BX
POP CX POP AX RETCOUNT55 ENDPCODE ENDS END
[email protected]
[email protected] 4-5
[email protected] 12 [email protected]
CPU4.6
[email protected] 4.9
BUFASCIIASCII7071011SETEVENBUFFERASCIIDIDSCXSTACK SEGMENT STACK
'STACK' DW 100H DUP(?)TOP LABEL WORDSTACK ENDS N=22DATA
SEGMENTBUFFER DB 'xidian university 2006'DATA ENDSCODE SEGMENT
ASSUME CS:CODE,DS:DATA,ES:DATA,SS:STACKSTART: MOV AX,DATA MOV DS,AX
MOV ES,AX MOV AX,STACK MOV SS,AX LEA
SP,[email protected] MOV CX,N LEA DI,BUFFERCALL
SETEVEN MOV AH,4CH MOV AL,0 INT 21HSETEVEN PROC NEAR PUSH AX PUSH
BX PUSH CX PUSH DISETEVEN1: MOV AL,[DI] CALL COUNTBYTE AND BL,01H1
; JZ SETEVEN2 OR AL,80H1 MOV [DI],AL
SETEVEN2:INC DILOOP SETEVEN1POP DIPOP CXPOP BXPOP
AXRETSETEVENENDPCOUNTBYTE PROC NEAR ;1 PUSH AX PUSH CX MOV CX,8 XOR
BL,BLCOU1: SHR AL,1 ADC BL,0 LOOP COU1 POP CX POP AX RETCOUNTBYTE
ENDPCODE ENDS END [email protected] 4.10
TRANS16TO1016(AX)16x5x10x1y1y1 x110x2y2y2y3
y4y5x5=0y5TRANS16TO10,AXDI [email protected] TRANS16TO10
PROC NEAR PUSH AX PUSH BX PUSH CX PUSH DX PUSH DI MOV BX,10 MOV
CX,5TRANS1: XOR DX,DX DIV BX MOV [DI],DL INC DI LOOP TRANS1POP
DIPOP DXPOP CXPOP BXPOP AXRETTRANS16TO10
[email protected] 4.11 DISPAXD16(AX)AX5INT
21H02ASCIIDISPAXDAX5STACK SEGMENT STACK 'STACK'DW 100H DUP(?)TOP
LABEL WORDSTACK ENDSDATA SEGMENTDECIMAL DB 5 DUP(?)DATA ENDSCODE
SEGMENTASSUME CS:CODE,DS:DATA,ES:DATA,SS:STACKSTART:MOV AX,DATAMOV
DS,AXMOV ES,AXMOV AX,STACKMOV SS,AX LEA SP,TOP
[email protected] MOV AX,23456 CALL DISPAXD MOV
AH,4CH ; MOV AL,0 INT 21HDISPAXDPROC NEAR PUSH AX PUSH BX PUSH CX
PUSH DX PUSH DI LEA DI,DECIMAL CALL TRANS16TO10 MOV CX,5 LEA
DI,DECIMAL+4 MOV AH,2
DISPAXD2: MOV DL,[DI] ADD DL,30H DEC DI INT 21H LOOP DISPAXD2
POP DI POP DX POP CX POP BX POP AX RETDISPAXD ENDPTRANS16TO10 PROC
NEAR ;4.10TRANS16TO10 ENDP CODE ENDSEND START
[email protected] 4.12 ASCII16BXFFFFH
4.9x1x5x1yy=10*(10*(10*(10*x5+x4)+x3)+x2)[email protected]
TRANS10TO16 PROC NEAR PUSH CX PUSH DX PUSH SI XOR AX,AX XOR
CX,CXMOV CL,[SI]INC SIMOV AL,[SI]INC SISUB AL,30HDEC CXJCXZ
TRANSF2MOV BX,10TRANSF1:MUL BXJC TRANSF_ERRMOV DL,[SI]INC SI SUB
DL,30H
ADD AL,DLADC AH,0JC TRANSF_ERRLOOP TRANSF1MOV BX,0TRANSF2:JMP
TRANSF_OKTRANSF_ERR:MOV BX,-1TRANSF_OK:POP SIPOP DXPOP
CXRETTRANS10TO16ENDP
[email protected] 4.13 164.11INT 21H0AHSTACK SEGMENT
STACK 'STACK' DW 100H DUP(?)TOP LABEL WORDSTACK ENDSDATA
SEGMENTKEYBUFFER DB 100 DB ? DB 100 DUP(?)STRING1 DB 'Please input
decimal data : ','$'DATA ENDSCODE SEGMENT ASSUME
CS:CODE,DS:DATA,ES:DATA,SS:STACKSTART: MOV AX,DATA MOV DS,AX MOV
ES,AX MOV AX,STACK MOV SS,AX LEA SP,TOP
[email protected] LEA DX,STRING1 MOV AH,09HINT 21HMOV
AH,0AHLEA DX,KEYBUFFERINT 21HLEA SI,KEYBUFFER+1CALL TRANS10TO16CALL
DISPCRCALL DISPAXCALL DISPCRMOV AX,BXCALL DISPAXBXMOV AH,4CH
;DOSMOV AL,0INT 21H
[email protected] DISPCR PROC NEAR PUSH AX PUSH DX
MOV AH,2 MOV DL,0AH INT 21H MOV AH,2 MOV DL,0DH INT 21H POP DX POP
AX RETDISPCR ENDPTRANS10TO16 PROC NEAR4.12TRANS10TO16 ENDPCODE ENDS
END STARTDISPAX PROC NEAR AX3.34DISPAX
[email protected] 4.14
16BUFFERCOMPUTMEANCOMPUTMEANSTACK SEGMENT STACK 'STACK' DW 100H
DUP(?)TOP LABEL WORDSTACK ENDSDATA SEGMENTBUFFER DW 1010DW
521,112,3654,-564,45, -166,771,1288,32709,-32014DATA ENDSCODE
SEGMENT ASSUME CS:CODE,DS:DATA,ES:DATA,SS:STACKSTART: MOV AX,DATA
MOV DS,AX MOV ES,AX MOV AX,STACK MOV SS,AX LEA SP,TOP
[email protected] MOV AX, OFFSET BUFFERPUSH AXCALL
COMPUTMEANPOP AXCALL DISPAXDISPAXAXMOV AH,4CH DOS INT 21HCOMPUTMEAN
PROC NEARPUSH BPMOV BP,SP BPPUSH SIPUSH DIPUSH AXPUSH BXPUSH CXPUSH
DXMOV SI,[BP+4]XOR DX,DXXOR BX,BXXOR DI,DIMOV CX,[SI]PUSH CXADD
SI,2CPTM1:MOV AX,[SI]ADD SI,2CWDADD
BX,[email protected] ADC DI,DXLOOP CPTM1MOV DX,DIMOV
AX,BXPOP BXIDIV BXCPTM2:MOV [BP+4],AX POP DXPOP CXPOP BXPOP AXPOP
DIPOP SIPOP [email protected] RETCOMPUTMEAN ENDPCODE
ENDS END START 4.6PUSHPOPSPBPBP
[email protected] 4.15 y=n!
kfactorialfkk+1f(k+1)=(k+1)f(k)n4.7n!nfactorialk1k=1,[email protected]
[email protected]
factorialRESULTfactorialk8RESULTRESULTfactorialN=7 75040
(13B0H)STACK SEGMENT STACK 'STACK' DW 100H DUP(?)TOP LABEL
WORDSTACK ENDSDATA SEGMENTRESULT DW ?DATA
[email protected] CODE SEGMENT ASSUME
CS:CODE,DS:DATA,ES:DATA,SS:STACKSTART: MOV AX,DATA MOV DS,AX MOV
ES,AX MOV AX,STACK MOV SS,AX LEA SP,TOP LEA SI,RESULT PUSH SI MOV
AX,N PUSH AXN CALL [email protected] MOV
AX,RESULT CALL DISPAX MOV AH,4CH DOS INT 21HFACTORIAL PROC NEARN!
PUSH BP MOV BP,SP PUSH BX PUSH AX MOV BX,[BP+6] MOV AX,[BP+4] k CMP
AX,1 JE FACT1 PUSH BX DEC AX [email protected] PUSH
AX CALL FACTORIAL FACTORIAL MOV BX,[BP+6] MOV AX,[BX] MUL WORD PTR
[BP+4] k!=k*(k-1)! JMP FACT2FACT1: MOV AX,1FACT2: MOV [BX],AX POP
AX POP BX POP BP RET 4 SPFACTORIAL ENDP
[email protected] CODE ENDS END
STARTFACTORIAL4.8CALLBPBPNFACTORIALCALLBPBPN-1BPN-2N=1RETxtwang@mail.xidian.edu.cn4.5
[email protected] :19, 21,
[email protected] You
[email protected]
SI
DI
4.3
X
1
2
3
4.4
BP
SI
BP
+2
+4
DI
AX
BX
CX
DX
SP
4.6
factorial
f(1)=1
k=1?
k=k-1
k=n
f(k+1)=kf(k)
factorial
k f(k)
4.7
