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lpthandler.exe 3bc 11111111

   o sino el puerto 378
lpthandler.exe 378 11111111

   o sino el puerto 278
lpthandler.exe 278 11111111

lpthandler.exe 3bc 00000000

   o sino el puerto 378
lpthandler.exe 378 00000000

   o sino el puerto 278
lpthandler.exe 278 00000000

/*
 En resumen solo necesitamos:
 
  Out32(Direccion_Base_Puerto_Paralelo+2, 0);          //Resetear Puerto de Control
  Out32(Direccion_Base_Puerto_Paralelo,   0xFF-0x00);  //Escribir el Puerto de Datos
*/
 
 
 
//Aquí, la Direccion_Base_Puerto_Paralelo
//puede ser:
//          0x3BC -- LPT1
//          0x378 -- LPT1
//          0x278 -- LPT2
///
 
//Necesitamos resetear el Puerto de Control escribiéndole un 0
//para configurar sus opciones, controladas por cada uno de
//sus bits:
///
  Out32(Direccion_Base_Puerto_Paralelo+2, 0);
 
//Enviamos un valor entre 0 y 255 al puerto de Datos:
///
  Out32(Direccion_Base_Puerto_Paralelo,   0xFF-0x00);
 

Out32(378h, 255-0);

//NOTE: Compile with GCC under MinGW.
//
// gcc lpthandler.c -o lpthandler.exe
//
//Usage:
// lpthandler.exe LPT_Port Byte_Bit_Data
//
// LPT_Port:
//  - can be 3bc, 378 or 278
//
// Byte_Bit_Data:
//  - can range from 00000000 to 11111111 (written like that, in binary).
//    Every bit controls one of 8 LEDs.
//
// LEDs are connected between DATA and GROUND lines.
// DATA to GROUND lines are connected like this, for pins:
//
// DATA is + and GROUND is -
//
//  2-18
//  3-19
//  4-20
//  5-21
//  6-22
//  7-23
//  8-24
//  9-25
//
// Remember to set the parallel ports as Standard/Normal in the BIOS
// to ensure proper working of the basics with this program.
///
 
#include <stdio.h>
#include <windows.h>
 
typedef short _stdcall (*_Out32)(short portaddr, short value);
typedef short _stdcall (*_Inp32)(short portaddr);
 
int main(int argc, char *argv[])
{
 HINSTANCE INPOUT32_DLL_Handle;
 _Inp32 Inp32;
 _Out32 Out32;
 
 
 //Load the inpout32.dll library. It's also associated
 //with hwinterface.sys, but it should open it by itself:
 ///
  INPOUT32_DLL_Handle=LoadLibrary("inpout32.dll");
  if(INPOUT32_DLL_Handle == NULL)
  {
   printf("LoadLibrary failed for inpout32.dll...\n\n");
   return -1;
  }
 
 
 //Get access to the Out32/Inp32 functions from inpout32.dll:
 ///
  Out32 = (_Out32)GetProcAddress(INPOUT32_DLL_Handle, "Out32");
  Inp32 = (_Inp32)GetProcAddress(INPOUT32_DLL_Handle, "Inp32");
 
 //NOTE: The following two lines are the actual logic of the program
 //      and are at the top of importance and the program's key logic.
 //      Everything else could be considered API noise:
 
 //Configure the CONTROL Port with a 0 to sanitize the port state:
 ///
  Out32(strtol(argv[1],NULL,16)+2, 0);  //Bit 0: Strobe
                                        //Bit 1: Auto Line Feed
                                        //Bit 2: Initialize Printer
                                        //Bit 3: Select Printer
                                        //Bit 4: Enable IRQ Via Ack Line
                                        //Bit 5: Enable Bi-Directional Port
                                        //Bit 6: Unused
                                        //Bit 7: Unused
 
 
 
 //Write the Data port with the desired 8-bit value:
 ///
  Out32(strtol(argv[1],NULL,16), strtol(argv[2],NULL,2));
 
 
 //Unload our inpout32.dll library:
 ///
  FreeLibrary(INPOUT32_DLL_Handle);
 
 return 0;
}