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<BR>編制一個CMOS維護工具<BR><BR><BR><BR>
CMOS保存著開機時必須用到的信息，如實時時鐘數(shù)據(jù)、日期、基本存儲器、擴展存儲器、驅(qū)動器信息、開機密碼等。但是一旦CMOS內(nèi)容被他人用SETUP作了修改或受CMOS病毒感染而面目全非，就會影響機器的正常工作，重新設置又須花較多時間，因此保存CMOS內(nèi)容并在必要時重新恢復，已成為維護PC機的一個不可缺少的環(huán)節(jié)。<BR>這里筆者提供給大家的源程序RWCMOS.C有二個功能：(1)可用來讀CMOS內(nèi)容，并在當前盤創(chuàng)建CMOS．DAT文件以保存CMOS信息；(2)必要時將CMOS.DAT中的內(nèi)容寫入CMOS中，以恢復丟失的信息。<BR>CMOS
RAM地址寄存器I/O端口為70H（用于寫），數(shù)據(jù)寄存器I/O端口為71H（用于讀/寫），CMOS內(nèi)容的讀寫就是從這二個I/O端口進行的。<BR>源程序用Turbo
C2.0寫成，在TINY模式下編譯，連接后，再用EXE2BIN.EXE將RWCMOS.EXE轉(zhuǎn)為RWCMOS.COM即可運行，讀者應先保存CMOS信息于CMOS.DAT中，并將CMOS>DAT及RWCMOS.COM一起存放于一可啟動軟盤中，供經(jīng)濟恢復用。<BR>附
RWCMOS.C<BR>#include<stdio.h><BR>#include<stdlib.h><BR>#include<conio.h><BR>#include<dos.h><BR>int
i;<BR>FILE *fp;<BR>void rdcmos(void);<BR>void
savecmos(void);<BR>void wtcmos(void);<BR>int
main()<BR>{<BR>system("cls");<BR>printf("\n\n\tSave CMOS Data
&& Restore CMOS Date Programe \n\n");<BR>printf("\t1.Save
CMOS Data to File:CMOS.DAT\n");<BR>printf("\t2.Restore CMOS Data
from File:CMOS.DAT\n");<BR>printf("\n\t Please Input Your
Choice:");<BR>scanf("%d",&i);<BR>switch(i){<BR>case
1:<BR>rdcmos();<BR>break;<BR>case
2:<BR>wtcmos();<BR>break;<BR>default:<BR>printf("\n\tWrong
Choice!");<BR>exit(1);<BR>break;<BR>}<BR>return 0;<BR>}<BR>void
rdcmos(void)<BR>{<BR>if((fp=fopen("CMOS.DAT","rb"))!=NULL){<BR>printf("\n\tFile:CMOS.DAT
Already
Exist,Overwrite(Y/N)?");<BR>i=getchar();<BR>if((i=='Y')||(i=='y')){<BR>fclose(fp);<BR>system("IF
EXITST CMOS.BAK DEL CMOS.BAK");<BR>system("REN CMOS.DAT
CMOS.BAK");<BR>savecmos();<BR>}<BR>else<BR>exit(1);<BR>}<BR>else<BR>savecmos();<BR>}<BR>void
savecmos(void)<BR>{<BR>if((fp=fopen("CMOS.DAT","wb"))==NULL){<BR>printf("\n\t
Can not Open
File:CMOS.DAT\n");<BR>exit(1);<BR>}<BR>for(i=0;i<256;i++)<BR>{<BR>outportb(0x70,i);<BR>putc(i,fp);<BR>}<BR>fclose(fp);<BR>}<BR>void
wtcmos(void)<BR>{<BR>if((fp=fopen("CMOS.DAT","rb"))==NULL)<BR>{<BR>printf("\n\tFile:CMOS.DAT
Does not
Exist!");<BR>exit(1);<BR>}<BR>for(i=0;i<256;i++){<BR>outportb(0x70,i);<BR>outportb(0x71,fgetc(fp));<BR>}<BR>fclose(fp);<BR>}
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