#include <conio.h>
#include <stdio.h>
#include <stdlib.h>
#include <string.h>
#include <conio.h>
#include <ctype.h>
#include <dos.h>
#include <process.h>
#include <stdarg.h>
#include <bios.h>
#include <ctype.h>


#define INPUT( port )        inp( port )
#define OUTPUT( port, data ) (void) outp( port, data )
#define CLI()                disable()
#define STI()                enable()


typedef enum {false, true} boolean;
typedef unsigned char byte;


#define TRANSMIT_HOLDING_REGISTER            0x00
#define RECEIVE_BUFFER_REGISTER              0x00
#define INTERRUPT_ENABLE_REGISTER            0x01
#define   IER_RX_DATA_READY                  0x01
#define   IER_TX_HOLDING_REGISTER_EMPTY      0x02
#define   IER_LINE_STATUS                    0x04
#define   IER_MODEM_STATUS                   0x08
#define INTERRUPT_ID_REGISTER                0x02
#define   IIR_MODEM_STATUS_INTERRUPT         0x00
#define   IIR_TX_HOLDING_REGISTER_INTERRUPT  0x02
#define   IIR_RX_DATA_READY_INTERRUPT        0x04
#define   IIR_LINE_STATUS_INTERRUPT          0x06
#define FIFO_CONTROL_REGISTER                0x02
#define   FCR_FIFO_ENABLE                    0x01
#define   FCR_RCVR_FIFO_RESET                0x02
#define   FCR_XMIT_FIFO_RESET                0x04
#define   FCR_RCVR_TRIGGER_LSB               0x40
#define   FCR_RCVR_TRIGGER_MSB               0x80
#define   FCR_TRIGGER_01                     0x00
#define   FCR_TRIGGER_04                     0x40
#define   FCR_TRIGGER_08                     0x80
#define   FCR_TRIGGER_14                     0xc0
#define LINE_CONTROL_REGISTER                0x03
#define   LCR_WORD_LENGTH_MASK               0x03
#define   LCR_WORD_LENGTH_SELECT_0           0x01
#define   LCR_WORD_LENGTH_SELECT_1           0x02
#define   LCR_STOP_BITS                      0x04
#define   LCR_PARITY_MASK                    0x38
#define   LCR_PARITY_ENABLE                  0x08
#define   LCR_EVEN_PARITY_SELECT             0x10
#define   LCR_STICK_PARITY                   0x20
#define   LCR_SET_BREAK                      0x40
#define   LCR_DLAB                           0x80
#define MODEM_CONTROL_REGISTER               0x04
#define   MCR_DTR                            0x01
#define   MCR_RTS                            0x02
#define   MCR_OUT1                           0x04
#define   MCR_OUT2                           0x08
#define   MCR_LOOPBACK                       0x10
#define LINE_STATUS_REGISTER                 0x05
#define   LSR_DATA_READY                     0x01
#define   LSR_OVERRUN_ERROR                  0x02
#define   LSR_PARITY_ERROR                   0x04
#define   LSR_FRAMING_ERROR                  0x08
#define   LSR_BREAK_DETECT                   0x10
#define   LSR_THRE                           0x20
#define MODEM_STATUS_REGISTER                0x06
#define   MSR_DELTA_CTS                      0x01
#define   MSR_DELTA_DSR                      0x02
#define   MSR_TERI                           0x04
#define   MSR_DELTA_CD                       0x08
#define   MSR_CTS                            0x10
#define   MSR_DSR                            0x20
#define   MSR_RI                             0x40
#define   MSR_CD                             0x80
#define DIVISOR_LATCH_LOW                    0x00
#define DIVISOR_LATCH_HIGH                   0x01



#define	QUESIZE	2048

typedef struct
{
	long	head, tail;		// bytes are put on head and pulled from tail
	unsigned char	data[QUESIZE];
} que_t;

void InitPort (void);
void ShutdownPort (void);

int read_byte( void );
void write_byte( int c );


void Error (char *error, ...);