ROM


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ROM

Computing
read only memory: a storage device that holds data permanently and cannot in normal circumstances be altered by the programmer

rom

[räm]
(electricity)
A unit of electrical conductivity, equal to the conductivity of a material in which an electric field of 1 volt per meter gives rise to a current density of 1 ampere per square meter. Derived from reciprocal ohm meter.

ROM

[räm]
(computer science)

ROM

ROM

(1) In an Android phone, a file for firmware updating. See Android ROM.

(2) (Read Only Memory) A memory chip that permanently stores instructions and data. Also known as "mask ROM," its content is created in the last masking stage of the chip manufacturing process, and it cannot be changed. Stand-alone ROM chips and ROM banks in microcontroller chips are used to hold control routines for myriad applications. ROMs were also widely used to hold the BIOS in early PCs as well as plug-in cartridges for video games.

Although EPROMs, EEPROMs, and particularly flash memory, are the kinds of non-volatile storage one hears about more often, ROM is a mature, inexpensive technology that is easy to integrate into the design of any CMOS chip.

ROMs Are Secure
Unlike flash memory, which can be updated, the data in ROM chips cannot be tampered with. If encryption keys and other security codes are stored in a ROM, they cannot be altered unless the chip is physically replaced (see secure boot). See memory types, RAM, EEPROM and flash memory.


ROMs Are Everywhere
Cartridges that contain nothing more than a ROM chip are widely used to hold games and educational programs. The yellow ROM cartridge in this image (bottom right) contains a program for the LeapPad Learning System for preschoolers.
References in periodicals archive ?
Unfortunately, the value of stretching that has permeated the literature is related to increasing joint mobility rather than achieving functional ROM in the shoulder, hip, knee, and ankle joints as they are involved in running.
The newly created ROM is functional--which means it will be involved in your running.
Windows and the ROM program are so user-friendly, anyone in the office can run a report for what they are looking for.
The portable bar code scanners and other automated devices that help the ROM software work effectively also have to be designed to endure the scrap environment.
The same development tools that serve existing Microchip Flash PIC microcontrollers support the ROM PIC microcontrollers.
The PIC16CR7X ROM microcontrollers are available today in 28-pin DIP, SOIC, SSOP, or QFN packages, 40-pin PDIP and PLCC packages, and a 44-pin QFP package option.