Date: Mon, 13 Feb 1995 13:04:57 -0500
From: davis AT amy DOT tch DOT harvard DOT edu ("John E. Davis")
To: djgpp AT sun DOT soe DOT clarkson DOT edu
Subject: Keyboard int 9

Hi,

  When I first started using DJGPP (1.10) there was no way to grab the
keyboad interrupt 9h.  Is it possible now?  All I want to do is to remap the
numlock key and for this I need to know when it is pressed and released.

  Below, I have attached the int 9 handler that I use for BCC.  Is there any
way I can get the same effect using djgpp?  I do not care if I use the
hardware interrup or not.  I just want the effect.

void interrupt int9_handler(void)
{
   unsigned char s, s1;
   unsigned int offset, f1_scan = 0x3B00;  /* f1 key */
   unsigned int *p;
   unsigned int numlock = 0x45;
   

   s1 = *shift & 0xF;  /* ignoring caps, ins, num lock, scroll lock */
   s = inp(0x60);
   if (s1 & 0x04)      /* control key */
     {
        if (s == 28)   /* Control - enter, ignore it!! */
	  {
	     s = inp(0x61);
	     outportb(0x61, s | 0x80);
	     outportb(0x61, s);
	     outportb(0x20, 0x20);
	     return;
	  }
     }
   else if (NumLock_Is_Gold && ((s & 0x7F) == numlock))
     {
	if (s == numlock)
	  {
	     offset = *kbnext;
	     offset += 2;
	     if (offset == *kbend) offset = *kbbeg;
	     if (offset != *kbptr)  /* buffer not full */
	       {
		  p = (unsigned int *) (0x400L + (*kbnext));
		  *p = f1_scan;
		  *kbnext = offset;
	       }
	  }
	s = inp(0x61);
	outportb(0x61, s | 0x80);
	outportb(0x61, s);
	outportb(0x20, 0x20);
	return;
     }
   (*oldint9)();
}

Thanks,
--John