Epson Equity 486DX2/50 PLUS User Manual - Page 214
Key disk, Kilobyte KB, LIM 4.0 EMS, Main system board, Math coprocessor
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A small device that connects two pins on an option card, a disk drive, or the main system board to activate a particular function. Key disk A diskette containing a copy-protected program that must remain in the diskette drive while you are using the program. Kilobyte (KB) A unit used to measure storage space in a computer's memory or on a disk. One kilobyte equals 1024 bytes. LIM 4.0 EMS Version 4.0 of the Lotus/Intel/Microsoft Expanded Memory Specification-a protocol that allows certain application programs to use memory that MS-DOS cannot use. Main system board The board built into your computer containing the circuitry the computer requires to operate. Math coprocessor A microprocessor that enables the computer to process certain mathematical calculations and display graphic images faster. In this computer, the 50 MHz model includes a built-in math coprocessor and the 25 MHz model can be upgraded with an 80487SX chip with built-in math coprocessor. MCGA Monochrome/Color Graphics Adapter. A type of display adapter that controls either a monochrome or color graphics monitor. 10 Glossary