www.pudn.com > port-vc.zip > DirectIOLib.h

extern "C" int PASCAL EXPORT openDirectIO(HWND hl); 
extern "C" unsigned char PASCAL EXPORT inportbyte(unsigned short port); 
extern "C" unsigned short PASCAL EXPORT inportword(unsigned short port); 
extern "C" unsigned long PASCAL EXPORT inportdword(unsigned short port); 
extern "C" void PASCAL EXPORT outportbyte(unsigned short port,unsigned char data); 
extern "C" void PASCAL EXPORT outportword(unsigned short port,unsigned short data); 
extern "C" void PASCAL EXPORT outportdword(unsigned short port,unsigned long data); 
extern "C" int PASCAL EXPORT unInstallDirectIO(void); 
extern "C" int PASCAL EXPORT getWinOS();