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);
      }
    }
  }
  

What's all this 0x40, 0x008 stuff ? - see A note on 8086/88 Memory Segmentation

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