CFREE4中没有BIOS.H,无法开串口,该怎么做??

#include <stdio.h>
#include <bios.h>
#include <conio.h>
#define COM1       0
#define DATA_READY 0×100
#define TRUE       1
#define FALSE      0
#define SETTINGS ( 0×80 | 0×02 | 0×00 | 0×00)
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;
}

 

 

tc可以通过,可CFREE不行.有朋友知道该怎么做吗??