#define   COM1  0
#define   COM2	1

#define   DATA  0x3f8	/* com2 : 0x2f..	*/
#define	  DL_LSB DATA
#define   IER   0x3f9
#define	  DL_MSB IER
#define   IIR   0x3fa
#define	  MCR	0x3fc
#define	  MSR	0x3fe
#define   LSR	0x3fd
#define   LCR	0x3fb

#define   ONMSK  0xef   /* Turn IRQ4 On	*/
#define   OFFMSK 0x10   /* Turn IRQ4 Off	*/

#define   PICMSK 0x21	/* 8259 mask register	*/
#define	  PICEOI 0x20 	/* 8259 EOI instr.	*/
#define   IRQ4   0x0c   /* interrupt vector for com1	*/
#define   IRQ3   0x0b   /* interrupt vector for com2	*/

#define   DATA7 0x02    /* Data is 7 bit	*/
#define   DATA8 0x03    /* Data is 8 bit        */

#define   STOP1 0x00	/* Stop Bit is  one      */

#define   NOPA	0x00	/* No Parity		 */
#define	  ODDP	0x08
#define	  EVEVP	0x18

#define   B1200	0x80	/* Baud rate is 1200 bps */
#define   B2400 0xa0
#define   B9600 0xe0

#define   BUFLEN 0x4000