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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
GetMem
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Reads one byte from the memory region. Mainly is intended for using in the Visual Basic applications where the direct manipulations with the pointers is difficult.

Language

Description

C/C++
UCHAR GetMem ( HANDLE hIsa, ULONG MappedAddress, ULONG MemOffset );
Delphi
function GetMem ( hIsa: THandle; MappedAddress: Longword; MemOffset: Longword ): Byte; stdcall;
VB
Function GetMem ( ByVal hIsa As Long, ByVal MappedAddress As Long, ByVal MemOffset As Long) As Byte


Parameters:
hIsa - the handle returned by a successful call to OpenRapidIsa ;
MappedAddress - the linear address returned by MapPhysToLinear
MemOffset - the offset value, should begin from the "0" value.

Return Value :
One byte value from the region.

Comments:

In general, "MappedAddress" can be any valid linear pointer to the memory. But if this pointer was received from the MapPhysToLinear function then you can access physical memory also.

See also: MapPhysToLinear UnmapMemory GetMemW GetMemL SetMem SetMemW SetMemL