(1) (Monochrome Display Adapter) The first IBM PC monochrome video display standard for text. Due to its lack of graphics, MDA cards were often replaced with Hercules cards, which provided both text and graphics. See PC display modes and Hercules Graphics.

(2) (Modular Digital Architecture) An earlier snap-together, building-block approach for adding peripherals to a PC from NeoSystems, Inc.

(3) (Mechanical Design Automation) Refers to applications that help automate the design and engineering processes from concept to manufacturing. Automotive, aerospace and discrete manufacturing are examples of industries that use MDA.