【正文】 _SEG ?DATA_SEG SEGMENTASSUME CS:CODE, DS:DATASTART: DB 17段界限 p=0,對應(yīng)段目前不在物理存儲器中,而要從磁盤上調(diào)出來。 TYPE 1000—代碼段,只執(zhí)行s=1, 為系統(tǒng)段描述符。 10, 1 Y5,A10 *AC00H~*AFFFHRam 地址線A19~A16,A15A14,A13~A11,A10,A 9~A0 Y2 *8000H~*87FFFHEprom 2 地址線A19~A16,A15A14,A13~A11,A10~A0 p=0,對應(yīng)段目前不在物理存儲器中,而要從磁盤上調(diào)出來。 89 SEGMENTASSUME CS:CODE, DS:DATA,SS:STACKSTART: MOV AX,DATAMOV DS,AXMOV AX,STACKMOV SS,AXMOV SP,OFFSET TOPMOV CH,0MOV CL,8LOP1: MOV SI,OFFSET BUFFMOV AX,OFFSET SUMPUSH AXMOV AH,0MOV AL, [SI]PUSH AXCALL FAR PTR FACTMOV DX,SUMADD SUM,DXINC SILOOP LOP1MOV AH,4CHINT 21HCODE ENDSCODES SEGMENTASSUME CS:CODESFACT PROC FARPUSH BPMOV BP,SPPUSH BXPUSH AXMOV BX,[BP+8]MOV AX,[BP+6]CMP AX,0JE DONEPUSH BXDEC AXPUSH AXCALL FACTMOV BX,[BP+8]MOV AX,[BX]MUL WORD PTR [BP+6]JMP RETURNDONE: MOV AX,01HRETURN:MOV [BX],AX SEGMENTSTRBUF SEGMENTASSUME CS:CODE, DS:DATA_SEGSTART: MOV AX, DATA_SEGMOV DS, AXMOV DX,OFFSET STR1MOV AH,09HINT 21HMOV DX,OFFSET STR2MOV AH,09HINT 21HMOV SI, OFFSET BUFMOV CX,10LOP1:MOV AH,1INT 21HMOV [SI], ALINC SILOOP LOP1MOV SI,OFFSET BUFMOV CX,9MOV AL, [SI]LOP2:CMP AL, [SI+1]JA NEXT2XCHG AL,[SI+1]INC SINEXT2:LOOP LOP2MOV MAX,ALMOV SI,OFFSET BUFMOV CX,9MOV AL, [SI]LOP3: CMP AL, [SI+1]JB NEXT3XCHG AL,[SI+1]INC SINEXT3:LOOP LOP3MOV MIN,ALMOV AH,4CHINT 21HCODE ENDSEND STARTDATA ENDSCODE JMP DONENEXT: MOV DATA,0MOV ? ?$39。 ENDSCODE DW (2) DW 2965H，45H，2965，0A6H③ALPHA DL= 1011 1001 SP=1FFEH2. 44H 2000H10H+0050H=20050HMOV AX,ES:[BX] 物理地址MOV AX, 00ABH 寄存器相對尋址 也可以根據(jù)系統(tǒng)總線得知。4①56 ②89 1. 隱含尋址TEST ES:[SI], DX 寄存器尋址 寄存器間接尋址 1FFEH AX=0000HDEC AX DX= 0000 0000 0001 0111=0017H③ DX=0000 0000 1011 1001 CX=0014H④ 109,98,21,40DATA4 DB 9DATA_SEG SEGMENTASSUME CS: CODE, DS:DATA_SEG,ES:DATA_SEGSTART: MOV AX, DATA_SEGMOV DS, AXMOV DS, AXMOV ES, AXMOV CH,0MOV CL, COUNTCLDMOV SI,OFFSET STR1MOV DI,OFFSET STR2REPZ JZ NEXTSUB DL,20HNEXT:MOV AH,2INT 21HINC SIJMP TAKECHARDONE:MOV AH,4CHINT 21HCODE ENDSEND START3．20DATA_SEG CMP DB CMP DB N DUP(?) SEGMENTBUF DB 10 JLE DONECMP AL,39。 MOV AX, DATAMOV DS, AXLEA SI, ST