#include <iostream>
#include <stdlib.h>
#include <dos.h>

unsigned char huge *lpt1_base = ( unsigned char huge * ) 0x0000:0x0408;
unsigned char huge *lpt2_base = ( unsigned char huge * ) 0x0000:0x040A;
unsigned char huge *lpt3_base = ( unsigned char huge * ) 0x0000:0x040C;
unsigned char huge *lpt4_base = ( unsigned char huge * ) 0x0000:0x040E;

unsigned char data_port( int port_num )
{
        switch ( port_num ) {
                case 1: return *lpt1_base;
                case 2: return *lpt2_base;
                case 3: return *lpt3_base;
                case 4: return *lpt4_base;
                default:
                        std::cerr << "Bad printer port number: '"
                             << port_num << "'\n";
                        exit( 1 );
        }
}

unsigned char status_port( int port_num )
{
        switch ( port_num ) {
                case 1: return *lpt1_base + 1;
                case 2: return *lpt2_base + 1;
                case 3: return *lpt3_base + 1;
                case 4: return *lpt4_base + 1;
                default:
                        std::cerr << "Bad printer port number: '"
                             << port_num << "'\n";
                        exit( 1 );
        }
}

unsigned char control_port( int port_num )
{
        switch ( port_num ) {
                case 1: return *lpt1_base + 2;
                case 2: return *lpt2_base + 2;
                case 3: return *lpt3_base + 2;
                case 4: return *lpt4_base + 2;
                default:
                        std::cerr << "Bad printer port number: '"
                             << port_num << "'\n";
                        exit( 1 );
        }
}

int main( int argc, char *argv[] )
{
        unsigned char 
}