Abstract: An apparatus and method are disclosed for testing memory and display adapter components of a multi-tasking computer system. The apparatus obtains a memory block and sends a request to a memory virtual device driver (VxD) to reserve, commit and lock the memory block to a physical memory. In requesting the memory block, the apparatus computes the number of virtual memory pages spanned by the request, reserves the pages of virtual memory, commits the virtual memory to a physical memory, and locks the virtual memory to the physical memory. The apparatus then obtains a physical address for the physical memory and returns the physical address for testing. Next, the apparatus tests the memory block using a number of memory test procedures. After the testing completes, the apparatus decommits and unlocks the physical memory before it traverses to the next entry of the chain. This process is repeated until all entries in the virtual memory chain have been tested.