EIA-530, also known as RS-530 or TIA-530, is a balanced serial interface standard that generally uses a 25-pin connector. The specification defines the cable between the DTE and DCE devices. It is a replacement for EIA-449, which uses 37-pin connector. EIA-530 refers to two electrical implementations of EIA/TIA-449: RS-422 for balanced transmission and RS-423 for unbalanced transmission.

Extremely Low Frequency (ELF) emission is radiation emitted by a computer monitor and other common electrical appliances. ELF emissions fall into the range of 5 to 2000 hertz and decline with the square of the distance from the source. Emissions are not constant around a monitor; they are higher from the sides and rear and weakest from the front of the screen. Low-emission models are available, and laptop computers with an LCD display do not emit any ELF fields. There is considerable debate about whether ELF emissions from computer monitors pose a threat. Some European countries have adopted regulations controlling the amount of allowable emission. The most well-know regulation is Sweden's MPR II standard. You can play it safe by buying MPR II-compliant monitors.

Extended Memory 64-bit Technology (EM64T) is Intel's implementation of AMD64, a 64-bit extension to the IA-32 architecture. Intel's first processor to actively implement the EM64T technology is the processor sold as Xeon. Intel is selling EM64T-enabled Pentium 4s on the market as the Pentium 4, model F.

Embedded system is a combination of computer hardware and software, and perhaps additional mechanical or other parts, designed to perform a special function, contrast with general-purpose computer. An embedded system is a programmed hardware device. In some cases, embedded systems are part of a larger system or product, as in the case of an antilock braking system in a car.

A voluntary labeling program of the U.S. Environmental Protection Agency (EPA) and the U.S. Department of Energy that identifies energy efficient products. Qualified products exceed minimum federal standards for energy consumption by a certain amount, or where no federal standards exist, have certain energy saving features. Such products may display the Energy Star label.

Enhanced keyboard, designed by IBM, has 101- or 102-key. The major difference between this and previous XT/AT keyboards is the twelve function keys arranged in a line across the top of the keyboard as opposed to ten grouped on the left hand side of the keyboard. Nearly all PCs made today come with an Enhanced Keyboard.

Electrically Programmable Logic Device (EPLD) is an integrated circuit that is comprised of an array of programmable logic devices that do not come pre-connected; the connections are programmed electrically by the user.

Erasable Programmable Read-Only Memory (EPROM) is a type of computer memory chip that retains its data when its power supply is switched off. It is an array of floating gate transistors individually programmed by an electronic device that supplies higher voltages than those normally used in electronic circuits. Once programmed, a EPROM can be erased only by exposing it to strong ultraviolet light. EPROMs are easily recognisable by the transparent window on the top of the package, through which the silicon chip can be seen, and which admits UV light during erasing. To write to and erase a EPROM, you need a special device called a PROM programmer or PROM burner.

Erasable Optical Disk is a type of optical disk that can be erased and re-loaded with new data. In contrast, most optical disks such as CD-ROMs, are read-only.

External Serial ATA (eSATA) is an enhanced storage interface. The initial SATA was designed as an internal or inside-the-box interface technology. With eSATA, customers can utilize shielded cable lengths up to 2 meters outside the PC to take advantage of the benefits the SATA interface brings to storage. eSATA provides more performance than existing solutions and is hot pluggable. , bringing improved performance and new features to internal PC or consumer storage.