#include <bios.h>
#include <conio.h>
#define COM1       0
#define DATA_READY 0x100
#define TRUE       1
#define FALSE      0
#define SETTINGS ( 0x80 | 0x02 | 0x00 | 0x00)
int main(void)
{
    int in, out, status, DONE = FALSE;
    bioscom(0, SETTINGS, COM1);
    cprintf("... BIOSCOM [ESC] to exit ...
");
    while (!DONE)
    {
        status = bioscom(3, 0, COM1);
        if (status & DATA_READY)
        if ((out = bioscom(2, 0, COM1) & 0x7F) != 0)
        putch(out);
        if (kbhit())
        {
            if ((in = getch()) == '')
           DONE = TRUE;
        bioscom(1, in, COM1);
        }
    }
    return 0;
}