All points addressable

All points addressable (APA), or pixel addressable, in the context of a dot matrix on a computer monitor or any display device consisting of a pixel array, refers to an arrangement whereby bits or cells can be individually manipulated, as opposed to rewriting the whole array, or regions such as characters, every time a change is needed.[1][2]

Generally, text modes are not all-points-addressable, whereas graphics modes are.[2] With the advent of more powerful computer graphics hardware, the use and importance of text-only display modes has declined, and with graphics modes it is generally taken for granted that they are all-points-addressable.


  1. Matick, R.; Ling, D. T.; Gupta, S.; Dill, F. (2006) [1984], "All points addressable raster display memory", IBM Journal of Research and Development, 28 (4): 379, retrieved 2013-09-28
  2. 1 2 Gonzalez, John Cambell (1982), Zippel, Richard E., ed., Implementing a window system for an all points addressable display, Massachusetts Institute of Technology, retrieved 2013-09-28

This article is issued from Wikipedia - version of the 10/11/2014. The text is available under the Creative Commons Attribution/Share Alike but additional terms may apply for the media files.