A collection of wires connecting the CPU with main memory that is used to identify particular locations (addresses) in main memory. The width of the address bus (that is, the number of wires) determines how many unique memory locations can be addressed. Modern PCs and Macintoshes have as many as 36 address lines, which enables them theoretically to access 64 GB (gigabytes)of main memory. However, the actually amount of memory that can be accessed is usually much less than this theoretical limit due to chipset and motherboard limitations.
- address space
The set of all legal addresses in memory for a given application. The address space represents the amount of memory available to a program. Interestingly, the address space can be larger than physical memory through a technique called virtual memory.
- address translation cache
Another name for a translation look-aside buffer.
- addressable resolution
In digital television the addressable resolution is the highest resolution signal that a display device (TV or monitor) can accept. A device in some circumstances may not be able to display the highest resolution it can receive.
- adjunct program
In computer-based training (CBT), also called computer-assisted instruction (CAI), an adjunct program is a device used by instructors to apply programming principles to course materials such as texts or manuals.
- administrative domain
A collection of networks, computers, and databases under a common administration, such as an enterprise’s intranet. The devices that operate in a singular administrative domain share common security features that are administered across the network and the entities that are associated with it.