🚀 go-pugleaf

I am interested in capturing the output to a serial port.  For instance, the
ability to create a log of any communications software.  I work in C++, primarily, and tried a small program which intercepts interrupt 14h and outputs it to
a second monochrome monitor.  The simple comm package I use obviously trigers
this interrupt, but I don't know which of the fields in the REGS structure
(al, ah, bl, etc.) is the one I'm really interested in .  None of them show
any recognizeable strings (e.g., ATDT, modem init str, ph #, etc).  Am I even
on the right track?  If you know of a pub domain utility which will serve the
same purpose, that is almost as good.  Any advice or even sample code??

Here is the gist of the code I wrote. mprintf outputs to the second monitor.
This is Zortech C++ 3.0, incidently.

extern "C"{
int comtomono(struct INT_DATA *pd);
}

void main(int argc, char **argv)
{
// install interrupt hook for COM1 or COM2 as designated on command line
//  int 0x0b is COM1, 0x0c is COM2
   int_off();
   int_intercept(0x0a+atoi(argv[1]), &comtomono, 0);
   int_on();

   system(argv[2]);   // run comm software

// restore original interrupt service chain
   int_off();
   int_restore(0x0a+atoi(argv[1]));
   int_on();

   exit(0);
}
extern "C" {
int comtomono(struct INT_DATA *pd)
{
   mprintf("%c%c\n", pd->regs.h.al, pd->regs.h.ah);
   return 0;
}
}


Any help is appreciated!!

Eric
jem@vuse.vanderbilt.edu