Thread: Show current date without using system timer

Hehe...pm OS , Protected Mode Operating System (the ones using CPU in protected mode). I think this is more clear

Originally Posted by Salem

Don't forget to say which Operating system / compiler / application type you're creating.

The program run on 386 40Mhz (embedded tiny board), test on PC DOS 7.01 with Turbo c++ 3.0 compiler.
Here is one of the code i have test...

Code:

#include <stdio.h>
#include <dos.h>

main()
{
  clrscr();
  while(!kbhit())
  {
  unsigned char day,month;
  unsigned int year;
  union REGS regin,regout;
  regin.h.ah=0x2A;
  intdos(&regin,&regout);
  day=regout.h.dl;
  month=regout.h.dh;
  year=regout.x.cx;
  printf("The date %d-%d-%d\r",day,month,year);
  }
return 0;
}

While i using this code, it really give me what i want. But when the program run in looping for a while(about 10 min), the date will increased by one day and the increment keep going on

Originally Posted by Salem

> If you quit the program and restart it, is the date back to normal (for a while), or is it permanently wrong?

Hi bro, if i quit the program and restart it, the date still got error(date increment) unless i restart the OS (DOS) and the date back to normal.

I have to put the code in looping because i need to do some data logging which included the date.

i'm setup the timer interrupt follows the guide from

http://www.inversereality.org/files/timerinterrupt.pdf and
http://www.beyondlogic.org/interrupts/interupt.htm

The interrupt working well as i expected. But in order to retrive the date without using system timer, some effort need to be put in...