{
    global.usbout = external_define('usb.dll','rs_putch',dll_cdecl,ty_real,1,ty_real);
    global.usbin= external_define('usb.dll','rs_getch',dll_cdecl,ty_real,0);
    
    global.usbavailable = external_define('usb.dll','rs_available',dll_cdecl,ty_real,0);
    global.usbaaa = external_define('usb.dll','rs_initialise',dll_cdecl,ty_real,2,ty_real,ty_real);
}


