www.pudn.com > IBM-PC CMOS.zip > CMOSLOOK.C

/* CMOSLOOK.C - Look at IBM PC/AT's Real-time Clock/CMOS RAM information 
 
   Jim Cronin  2-86 
*/ 
 
#include  
#define IOADDRESS 0x070 
#define IODATA    0x071 
 
static char *what[] = { 
/* 00 */ "Seconds",                            "Second alarm",  
/* 02 */ "Minutes",                            "Minute alarm",  
/* 04 */ "Hours",                              "Hour alarm",    
/* 06 */ "Day of week",                        "Date of month", 
/* 08 */ "Month",                              "Year", 
/* 0A */ "Status register A",                  "Status register B", 
/* 0C */ "Status register C",                  "Status register D",  
/* 0E */ "Diagnostic status byte",             "Shutdown status byte", 
/* 10 */ "Diskette drive type byte - drives A and B","Reserved", 
/* 12 */ "Fixed disk type byte - drives C and D",    "Reserved", 
/* 14 */ "Equipment byte",                     "Low base memory byte",    
/* 16 */ "High base memory byte",              "Low expansion memory byte", 
/* 18 */ "High expansion memory byte",         "Reserved", 
/* 1A */ "Reserved",                           "Reserved", 
/* 1C */ "Reserved",                           "Reserved", 
/* 1E */ "Reserved",                           "Reserved", 
/* 20 */ "Reserved",                           "Reserved", 
/* 22 */ "Reserved",                           "Reserved", 
/* 24 */ "Reserved",                           "Reserved", 
/* 26 */ "Reserved",                           "Reserved", 
/* 28 */ "Reserved",                           "Reserved", 
/* 2A */ "Reserved",                           "Reserved",  
/* 2C */ "Reserved",                           "Reserved", 
/* 2E */ "Checksum byte 1",                    "Checksum byte 2", 
/* 30 */ "Low expansion memory byte",          "High expansion memory byte", 
/* 32 */ "Date century byte",                  "Information flags", 
/* 34 */ "Reserved",                           "Reserved", 
/* 36 */ "Reserved",                           "Reserved", 
/* 38 */ "Reserved",                           "Reserved", 
/* 3A */ "Reserved",                           "Reserved", 
/* 3C */ "Reserved",                           "Reserved",  
/* 3E */ "Reserved",                           "Reserved", ""}; 
 
 
main () 
{ 
   unsigned char location, value; 
   extern unsigned char inportb(); 
 
   printf (" Loc.  Hex  Binary  Name\n ----  ---  --------  ----\n"); 
   for (location = 0; *what[location] != '\0'; location++) 
       { 
       outportb (IOADDRESS, location); 
       value = inportb (IODATA); 
       printf (" %4x  %3x  %8b  %s\n",  
               location, value, value, what[location]); 
       } 
}