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From: "JM Rams" <josepmaria AT turomas DOT com>
To: <djgpp AT delorie DOT com>
Subject: RE: PM interrupt handling - how to call old old ISR with slower rate than my new ISR
Date: Fri, 2 Nov 2007 09:42:37 +0100
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I had the same problem as you. I need an interrupt every 1 ms or less. First
I not chain my new interrupt and I called old interrupt when necessary but I
had problems. Now I chain my interrupt and after I gets down timer counter.

Note: "div" is the my new timer divisor (Old is 0).




void executa_timer()
{
ara_toca=ara_toca+div;
if(ara_toca>=0x10000){
  	ara_toca=ara_toca-0x10000;
	}
else{
	fes_int0_2();
    }
}

void fes_int0_2()
{
long int tics;

tics=_farpeekb(_dos_ds, 0x440);
if(tics!=0)tics++;
_farpokeb(_dos_ds, 0x440,tics);

tics=_farpeekl(_dos_ds, 0x46c);
tics--;
_farpokel(_dos_ds, 0x46c,tics);
}