#include <sys/io.h>

#define BASE 0x3f8 /* COM1 */
#define DATA_FMT_REGISTER BASE+3

/* 9600 baud, 8N1 format */
void init()
{
    unsigned char val;
    unsigned char divisor_low, divisor_high;

    val = inb(DATA_FMT_REGISTER);
    val = val|0x80; /* set DLAB */
    outb(val, DATA_FMT_REGISTER);
    divisor_low = 12;
    divisor_high = 0;

    outb(divisor_low, BASE);  
    outb(divisor_high, BASE+1);
    outb(3, DATA_FMT_REGISTER);
}
main()
{
    int i, c;
    iopl(3);
    init();
    while(1) {
        while((inb(BASE+0x5)&0x1) != 1);
        c = inb(BASE);
        printf("%d: %c\n", c, c);
    }
}