Hi
I have a problem, because I donŽt know C- language !!!
I wanŽt to know how this C code works (it sends byte trough the parallel
port to my Ti calculator, the link only has 3 wires and one is GND ).
 I want to translate it to PIC, so I can interface my Ti with the PIC
Anything would help, just a few comnents and IŽll try to figure out the rest
Thanks for you time
Javier

/*
   * Sends a byte to the calculator
   */
  int put92(char data)
  {
    int bit;
    for (bit=0; bit<8; bit++) {
      if (bit==1) tx(1);
      if (data&1) {
        outportb(lpt_out, 2);
        while (inportb(lpt_in)&0x10);
        outportb(lpt_out, 3);
        while ((inportb(lpt_in)&0x10)==0x00);
      } else {
        outportb(lpt_out, 1);
        while (inportb(lpt_in)&0x20);
        outportb(lpt_out, 3);
        while ((inportb(lpt_in)&0x20)==0x00);
      }
      data>>=1;
      // may need 10us delay here
    }
  }


  /*
   * Reads a byte from the calculator
   */
  unsigned char get92(void)
  {
    int bit;
    unsigned char data=0, v;
    for (bit=0; bit<8; bit++) {
      while ((v=inportb(lpt_in)&0x30) == 0x30);
      if (v==0x10) {
        data=(data>>1)|0x80;
        outportb(lpt_out, 1);
        while ((inportb(lpt_in)&0x20)==0x00);
        outportb(lpt_out, 3);
      } else {
        data=data>>1;
        outportb(lpt_out, 2);
        while ((inportb(lpt_in)&0x10)==0x00);
        outportb(lpt_out, 3);
      }
      // may need 10us delay here
    }
    return data;
  }