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Contents Programming For ISA Hardware Overview Programmers Guide Scenario I/O Ports control Single read/write operations Data array read/write operations Accessing Physical Memory Addresses Memory Mapping Additional Functions Hardware interrupts handling at user level Common Functions OpenRapidIsa CloseRapidIsa IsRapidIsaOpened GetHardwareConfiguration Direct Port I/O GetPortByte GetPortWord GetPortLong SetPortByte SetPortWord SetPortLong ReadPortBuffer WritePortBuffer Memory Access MapPhysToLinear UnmapMemory GetMem GetMemW GetMemL SetMem SetMemW SetMemL Hardware Interrupts UnmaskIsaIrq MaskIsaIrq GetInterruptCounter		Additional Functions Go to RapidDriver Main Page As it was mentioned, the MapPhysToLinear function returns the pointer to the linear memory defined by it's physical address and size. You can work with a returned pointer directly or by means of additional functions set which provides physical memory access by bytes, by words or by double words. It's especially useful for Visual Basic programmers as Visual basic has some limitations on working with a pointers directly. Below is the list of the above mentioned functions: UCHAR  GetMem  (HANDLE hIsa, ULONG LinAddr, ULONG Offset);   USHORT GetMemW (HANDLE hIsa, ULONG LinAddr, ULONG Offset);    ULONG  GetMemL (HANDLE hIsa, ULONG LinAddr, ULONG Offset);    void   SetMem  (HANDLE hIsa, ULONG LinAddr, ULONG Offset, UCHAR bValue);   void   SetMemW (HANDLE hIsa, ULONG LinAddr, ULONG Offset, USHORT wValue);    void   SetMemL (HANDLE hIsa, ULONG LinAddr, ULONG Offset, ULONG dValue);