IBM Monochrome Display Adapter

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The IBM monochrome display adapter (MDA) was one of two display adapters offered with the IBM Personal Computer. It used a 6845 CRT controller and 4KB of RAM to implement a 40x80 text mode display capable of two levels of intensity, bold, and underline effects. No graphics modes were supported, but as IBM expected it to be primarily purchased by business users it did include a parallel printer port. It's RAM and I/O ports were deliberately mapped to different locations than the CGA graphics card, allowing the MDA to be used simultaneously with a colour graphics board.

Date : Unknown

Manufacturer : IBM

Format : Expansion Board

Physical Description : Expansion board

This exhibit has a reference ID of CH45038. Please quote this reference ID in any communication with the Centre for Computing History.