MDA Monochrome Display Adapter
Only show the text of a monochrome display criteria.

MDRAM Mountebank DRAM
MOSYS developed by the company's memory (MEMORY) architecture, traditional architecture will be different is MDRAM reduced the capacity of BANK and make use of every one BANK separate bus (BUS) input and output ports (I / O PORT), so The result is MDRAM simultaneous access to several BANK, to read and write data faster, and can use a smaller increase in the number memory.

Megabit Data
another was to do MBIT, or MB, see BIT.

Memory Hardware’s
Memory, data storage devices, divided into the RAM or ROM.