📄 编制一个cmos维护工具.htm
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<BR>编制一个CMOS维护工具<BR><BR><BR><BR>
CMOS保存着开机时必须用到的信息，如实时时钟数据、日期、基本存储器、扩展存储器、驱动器信息、开机密码等。但是一旦CMOS内容被他人用SETUP作了修改或受CMOS病毒感染而面目全非，就会影响机器的正常工作，重新设置又须花较多时间，因此保存CMOS内容并在必要时重新恢复，已成为维护PC机的一个不可缺少的环节。<BR>这里笔者提供给大家的源程序RWCMOS.C有二个功能：(1)可用来读CMOS内容，并在当前盘创建CMOS．DAT文件以保存CMOS信息；(2)必要时将CMOS.DAT中的内容写入CMOS中，以恢复丢失的信息。<BR>CMOS
RAM地址寄存器I/O端口为70H（用于写），数据寄存器I/O端口为71H（用于读/写），CMOS内容的读写就是从这二个I/O端口进行的。<BR>源程序用Turbo
C2.0写成，在TINY模式下编译，连接后，再用EXE2BIN.EXE将RWCMOS.EXE转为RWCMOS.COM即可运行，读者应先保存CMOS信息于CMOS.DAT中，并将CMOS>DAT及RWCMOS.COM一起存放于一可启动软盘中，供经济恢复用。<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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