Borland C version of FindLPT

// Detecting available LPT ports on an IBM PC
// Borland C++ for DOS
// Stephen Russell Warren <srw1@doc.ic.ac.uk>

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

#define MAXLPT 3

void main(void) {
  int      lptno;
  unsigned lptaddr[MAXLPT];

  for (lptno=0; lptno<MAXLPT; lptno++) {
    lptaddr[lptno]=*(unsigned far *)(MK_FP(0x40, 0x008+(lptno*2)));

    if (lptaddr[lptno]) {
      printf("LPT%d found at 0x%04x\n", lptno+1, lptaddr[lptno]);
    } else {
      printf("LPT%d not found\n", lptno+1);
    }
  }
}

last updated: 12-Mar-97 Ian Harries <ih@doc.ic.ac.uk>