EXTERN PCI_TEXT:NEAR
EXTERN ADDRESS_USER:WORD
.MODEL SMALL
.DATA
IOADD DW 62H
MSG0 DB 'PRESS ANY KEY TO QUIT$!';
.STACK 100H
.CODE
.STARTUP
CALL PCI_TEST
MOV AH,9
MOV DX,OFFSET MSG0
INT 21H
MOV AX,ADDRESS_USER
ADD IOADD,AX
MOV BL,0
NEXT1:
MOV DX,IOADD
IN AL,DX
CMP AL,BL
JZ NEXT2
MOV BL,AL
OUT DX,AL
MOV DL,AL
MOV AH,2
INT 21H
NEXT2:
MOV AH,6
MOV DL,0FFH
INT 21H
JZ NEXT1
MOV AH,4CH
INT 21H
END
求每部讲解说明。谢谢各位了，帮帮忙!