To allow programmers to use a larger virtual address space than is actually available in the Direct Memory Access ( DMA ) ( synchronous, page-by-page copy ).
42.
Some effective address calculations by instructions located beyond the original 18-bit address space were performed to 30 significant bits, although only a 23-bit virtual address space was supported.
43.
Process isolation can be implemented with virtual address space, where process A's address space is different from process B's address space preventing A from writing onto B.
44.
On systems with no pagefile, it is still counted, but all such virtual address space must remain in physical memory ( RAM ) at all times ( once it is accessed ).
45.
Software within the operating system may extend these capabilities to provide a virtual address space that can exceed the capacity of real memory and thus reference more memory than is physically present in the computer.
46.
The most significant new feature ( called " extended addressing " ) was modified pager microcode running on a " Model B " hardware revision to enlarge the user virtual address space.
47.
Using BASIC-PLUS, about half of this virtual address space was used by the combined command interpreter and run-time library ( named the Disk files could also be used but were slower.
48.
They are shared virtual memory spaces that may be attached and detached from a given job's virtual address space and the same addresses may have different contents depending on which named address spaces are attached.
49.
:I assume, incidentally, that when you say " a different virtual address space for jump instructions " you include conditional jumps ( branches ) .-- Talk 16 : 43, 20 April 2010 ( UTC)
50.
Under Windows 8.1 and Windows Server 2012 R2, both user mode and kernel mode virtual address spaces have been extended to 128 TB . These versions of Windows will not install on processors that lack the CMPXCHG16B instruction.
