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Read-Only Memory

1

Read-only memory is a type of non-volatile memory used in computers and other electronic devices.

Non-volatile memory or non-volatile storage is a type of computer memory that can retrieve stored information even after having been power cycled.

A computer is a device that can be instructed to carry out an arbitrary set of arithmetic or logical operations automatically.

Digital Logic - Read Only Memory by Robot Brigade

2

Data stored in ROM can only be modified slowly, with difficulty, or not at all, so it is mainly used to store firmware or application software in plug-in cartridges.

Computer software, or simply software, is that part of a computer system that consists of encoded information or computer instructions, in contrast to the physical hardware from which the system is built.

In electronic systems and computing, firmware is a specific class of computer software that provides the low-level control for the device's specific hardware.

An application software is computer software designed to perform a group of coordinated functions, tasks, or activities for the benefit of the user.

Read Only Memory by Columbia Gorge Community College

3

Strictly, read-only memory refers to memory that is hard-wired, such as diode matrix and the later mask ROM, which cannot be changed after manufacture.

A diode matrix is a two-dimensional grid of wires: each "intersection" wherein one row crosses over another has either a diode connecting them, or the wires are isolated from each other.

Mask ROM is a type of read-only memory whose contents are programmed by the integrated circuit manufacturer.

4

Although discrete circuits can be altered in principle, integrated circuits cannot, and are useless if the data is bad or requires an update.

An integrated circuit or monolithic integrated circuit is a set of electronic circuits on one small flat piece of semiconductor material, normally silicon.

5

That such memory can never be changed is a disadvantage in many applications, as bugs and security issues cannot be fixed, and new features cannot be added.

6

More recently, ROM has come to include memory that is read-only in normal operation, but can still be reprogrammed in some way.

7

Erasable programmable read-only memory and electrically erasable programmable read-only memory can be erased and re-programmed, but usually this can only be done at relatively slow speeds, may require special equipment to achieve, and is typically only possible a certain number of times.

An EPROM, or erasable programmable read-only memory, is a type of memory chip that retains its data when its power supply is switched off.

A prom is a formal social event – usually a dance – generally held near the end of the last two years of high school.

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