World Library  
Flag as Inappropriate
Email this Article

Multi-Color Graphics Array

Article Id: WHEBN0000474241
Reproduction Date:

Title: Multi-Color Graphics Array  
Author: World Heritage Encyclopedia
Language: English
Subject: Color Graphics Adapter, Video Graphics Array, Computer display standard, Epson Equity, Computer display standards
Collection: Computer Display Standards, Ibm Personal Computers, Products Introduced in 1987
Publisher: World Heritage Encyclopedia
Publication
Date:
 

Multi-Color Graphics Array

Multi-Color Graphics Array
Release date 1987 (1987)
Cards
Entry-level IBM PS/2 Model 30 & 25 motherboards; Epson Equity Ie motherboard
History
Predecessor Color Graphics Adapter
Successor Video Graphics Array

The Multi-Color Graphics Array or MCGA was a video subsystem built into the motherboard of the IBM PS/2 Model 30, introduced on April 2, 1987, and Model 25, introduced later on August 11; no standalone MCGA cards were ever made.[1]

The MCGA supported all CGA display modes plus 640×480 monochrome at a refresh rate of 60 Hz, and 320×200 with 256 colors (out of a palette of 262,144) at 70 Hz. The display adapter used a DE-15 connector. The MDA monochrome text mode was not supported.

MCGA was similar to VGA in that it had a 256-color mode (the 256-color mode in VGA was sometimes referred to as MCGA) and used 15-pin analog connectors. The PS/2 chipset's limited abilities prevented EGA compatibility and high-resolution multi-color VGA display modes.

The tenure of MCGA was brief; the PS/2 Model 25 and Model 30 were discontinued by 1992, and no manufacturer produced a clone of this display adapter except for Epson Equity Ie, since the VGA standard introduced at the same time was considered superior.[2]

Contents

  • Software support 1
  • Output capabilities 2
  • See also 3
  • References 4

Software support

The 256-color mode proved most popular for gaming. 256-color VGA games ran fine on MCGA as long as they stuck to the basic 320×200 256-color mode and didn't attempt to use VGA-specific features such as multiple screen pages.

Games lacking support for 256-color graphics were forced to fall back to four-color CGA mode (or not run at all) due to the incompatibility with EGA video modes (320×200 16 colors). Some adventure games from Sierra On-line and Lucasfilm Games solved this problem by supporting MCGA in its 320×200 256-color mode and picking the colors most resembling the EGA 16-color RGB palette, while leaving the other available colors in that mode unused.

Output capabilities

MCGA offered:

  • 640x480 monochrome
  • 320x200 in 256 colors (from a palette of 262,144)

CGA compatible modes:

  • 320x200 in 4 colors from a 16 color hardware palette. Pixel aspect ratio of 1:1.2.
  • 640×200 in 2 colors. Pixel aspect ratio of 1:2.4
  • 160×100 16 color mode
  • 40×25 text mode with 8×8 pixel font (effective resolution of 320×200)
  • 80×25 text mode with 8×8 pixel font (effective resolution of 640×200)

See also

References

  1. ^ The PC Graphics Handbook, p. 122, at Google Books
  2. ^ https://files.support.epson.com/pdf/e1e___/e1e___ps.pdf
This article was sourced from Creative Commons Attribution-ShareAlike License; additional terms may apply. World Heritage Encyclopedia content is assembled from numerous content providers, Open Access Publishing, and in compliance with The Fair Access to Science and Technology Research Act (FASTR), Wikimedia Foundation, Inc., Public Library of Science, The Encyclopedia of Life, Open Book Publishers (OBP), PubMed, U.S. National Library of Medicine, National Center for Biotechnology Information, U.S. National Library of Medicine, National Institutes of Health (NIH), U.S. Department of Health & Human Services, and USA.gov, which sources content from all federal, state, local, tribal, and territorial government publication portals (.gov, .mil, .edu). Funding for USA.gov and content contributors is made possible from the U.S. Congress, E-Government Act of 2002.
 
Crowd sourced content that is contributed to World Heritage Encyclopedia is peer reviewed and edited by our editorial staff to ensure quality scholarly research articles.
 
By using this site, you agree to the Terms of Use and Privacy Policy. World Heritage Encyclopedia™ is a registered trademark of the World Public Library Association, a non-profit organization.
 


Copyright © World Library Foundation. All rights reserved. eBooks from Project Gutenberg are sponsored by the World Library Foundation,
a 501c(4) Member's Support Non-Profit Organization, and is NOT affiliated with any governmental agency or department.