#define CPU_FREQ 1843200

__sfr __at 0x30 sio_a_data;
__sfr __at 0x31 sio_b_data;
__sfr __at 0x32 sio_a_ctrl;
__sfr __at 0x33 sio_b_ctrl;

void putchar(char c)
{
    unsigned char ctrl = 0;

    sio_a_data = c;

    while (!(ctrl & 0x04)) {
        sio_a_ctrl = ctrl;
        ctrl = sio_a_ctrl;
    }
}

void print(const char *str)
{
    for (; *str; str++)
        putchar(*str);
}

int main()
{
    print("Hello World from C");
    return 0;
}