Skip to main content

base-bound register

base-bound register (base-limit register) Hardware used for virtual-memory allocation. A base-bound register is associated with each segment of data or code and defines the position in physical memory of word zero for that segment, the so-called base, and the number of words available to that segment, the so-called bound or limit (or alternatively the physical memory address of the next word after the end of the segment, in which case it is a bounds register). Whenever a process attempts to access the memory segment, the hardware of the system checks that the address of the word lies within the range 0 ← word address < bound

and then adds the address to the value contained in the base register to give the physical address. A restriction on this system is that the storage for the segment must be allocated in a contiguous area of memory (see best fit, first fit).

The base register, used in the construction of relative addresses, should not be confused with the base of a base-bound system; the result of modifying an address by a base register's contents is still an address within virtual memory space of the process, and is not necessarily a physical address.

Cite this article
Pick a style below, and copy the text for your bibliography.

  • MLA
  • Chicago
  • APA

"base-bound register." A Dictionary of Computing. . 16 Mar. 2019 <>.

"base-bound register." A Dictionary of Computing. . (March 16, 2019).

"base-bound register." A Dictionary of Computing. . Retrieved March 16, 2019 from

Learn more about citation styles

Citation styles gives you the ability to cite reference entries and articles according to common styles from the Modern Language Association (MLA), The Chicago Manual of Style, and the American Psychological Association (APA).

Within the “Cite this article” tool, pick a style to see how all available information looks when formatted according to that style. Then, copy and paste the text into your bibliography or works cited list.

Because each style has its own formatting nuances that evolve over time and not all information is available for every reference entry or article, cannot guarantee each citation it generates. Therefore, it’s best to use citations as a starting point before checking the style against your school or publication’s requirements and the most-recent information available at these sites:

Modern Language Association

The Chicago Manual of Style

American Psychological Association

  • Most online reference entries and articles do not have page numbers. Therefore, that information is unavailable for most content. However, the date of retrieval is often important. Refer to each style’s convention regarding the best way to format page numbers and retrieval dates.
  • In addition to the MLA, Chicago, and APA styles, your school, university, publication, or institution may have its own requirements for citations. Therefore, be sure to refer to those guidelines when editing your bibliography or works cited list.