Memory above and beyond the standard 1MB (megabyte) of main memory that DOS supports. Extended memory is only available in PCs with an Intel 80286 or later microprocessor.
Two types of memory can be added to a PC to increase memory beyond 1MB: expanded memory and extended memory. Expanded memory conforms to a published standard called EMS that enables DOS programs to take advantage of it. Extended memory, on the other hand, is not configured in any special manner and is therefore unavailable to most DOS programs. However, MS-Windows and OS/2 can use extended memory.
(1) An extra feature added to a standard programming language or system. (2) In DOS and some other operating systems, one or several letters at the end of a filename. Filename extensions usually follow a period (dot) and indicate the type of information stored in the file. For example, in the filename EDIT.COM, the extension […]
- external bus
Another name for an external data bus.
- external command
In DOS systems, any command that does not reside in the COMMAND.COM file. This includes all other COM files, as well as EXE and BAT files. Commands in the COMMAND.COM file are called internal commands.
- external data bus
A bus that connects a computer to peripheral devices. Two examples are the Universal Serial Bus (USB) and IEEE 1394. Contrast with internal data bus. The bit width of internal and external data buses are not always equal.
- External Hard Drive
A hard drive that is outside of the computer case in its own enclosure. Most external hard drives support the IDE interface and are slightly bigger than a hard drive itself. When purchasing an external hard drive you can buy a full external hard drive system that consists of both the hard drive and the […]