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What (who) is main memory - definition

STORAGE OF DIGITAL DATA READABLE BY COMPUTERS

Computer Storage; Auxiliary storage; Internal memory; Main storage; Primary storage; Primary Storage; Secondary storage; Main memory; Primary memory; Physical memory; Data disk; Secondary storage device; Secondary storage devices; Data retention hardware; Tertiary storage; Off-line storage; Offline storage; Physical and logical storage; Real storage; Computer storage device; Secondary memory; PC memory; Computer storage; Disk capacity and file size; Disk capacity; Store of computer; Auxiliary Memory Units; Internal Memory; Rewritable media; Primary data storage; EM data structure; Disk space; Storage system; Media (computer); Auxiliary memory; Auxiliary Memory; Computer storage devices; Storage memory; Storage device (computing); All-flash array; Diskspace; Storage capacity (computing); Data storage capacity; Memory capacity

main memory

<storage, architecture> The storage device used by a computer to hold the currently executing program and its working data. A modern computer's main memory is built from random-access memory integrated circuits. In the old days ferrite core memory was one popular form of main memory, leading to the use of the term "core" for main memory. Computers have several other sorts of memory, distinguished by their access time, storage capicity, cost, and the typical lifetime or rate of change of the data they hold. Registers in the CPU are fast, few, expensive and typically change every few machine instructions. Other kinds are cache, PROM, magnetic disk (which may be used for {virtual memory}) and magnetic tape. (1996-11-04)

Very Large Memory

PHYSICAL DEVICE USED TO STORE INFORMATION FOR IMMEDIATE USE IN A DIGITAL ELECTRONIC DEVICE

Memory (Computer); Computer Memory; Memory (computers); Memory (computer); Memory (computing); Memory device; PLEDM; Types of computers memory; Address Memory; Off-chip memory; History of computer memory; Very large memory

<architecture> (VLM) A processor and operating system that can use more than 4GB of RAM, which is the limit for systems using 32-bit addresses. VLM architectures allow application programs and {Very Large Databases} with more than 4GB of data to be placed entirely in physical memory, with large performance enhancements. Some recent processors like the DEC Alpha can process 64 bits of data at a time and use addresses wider than 32 bits. Digital Unix (http://unix.digital.com/unix/64bit/). (Solaris http://sun.com/solaris/64bit.html). (SGI http://sgi.com/Technology/standard/faq.html). (Unix 98 http://UNIX-systems.org/version2/whatsnew/login_64bit.html). [How wide are the address busses?] (1998-07-07)

Computer memory

PHYSICAL DEVICE USED TO STORE INFORMATION FOR IMMEDIATE USE IN A DIGITAL ELECTRONIC DEVICE

Memory (Computer); Computer Memory; Memory (computers); Memory (computer); Memory (computing); Memory device; PLEDM; Types of computers memory; Address Memory; Off-chip memory; History of computer memory; Very large memory

In computing, memory is a device or system that is used to store information for immediate use in a computer or related computer hardware and digital electronic devices. The term memory is often synonymous with the term primary storage or main memory.

https://en.wikipedia.org/wiki/Computer_memory

Wikipedia

Computer data storage

Computer data storage is a technology consisting of computer components and recording media that are used to retain digital data. It is a core function and fundamental component of computers.^: 15–16

The central processing unit (CPU) of a computer is what manipulates data by performing computations. In practice, almost all computers use a storage hierarchy,^{: 468–473} which puts fast but expensive and small storage options close to the CPU and slower but less expensive and larger options further away. Generally, the fast technologies are referred to as "memory", while slower persistent technologies are referred to as "storage".

Even the first computer designs, Charles Babbage's Analytical Engine and Percy Ludgate's Analytical Machine, clearly distinguished between processing and memory (Babbage stored numbers as rotations of gears, while Ludgate stored numbers as displacements of rods in shuttles). This distinction was extended in the Von Neumann architecture, where the CPU consists of two main parts: The control unit and the arithmetic logic unit (ALU). The former controls the flow of data between the CPU and memory, while the latter performs arithmetic and logical operations on data.

https://en.wikipedia.org/wiki/Computer data storage

Examples of use of main memory

1. My main memory is of argument, dissent and desertion.

2. He didn‘t make much news, but my main memory is he didn‘t think much of then–President Lyndon Johnson.

3. "My main memory of my time there is of (he names a prison officer). He always seemed to have it in for me.

4. "One man came up to me and said ‘I suffer from panic attacks.‘ I told him, ‘It‘s probably not a good day for that, sir.‘ " But his main memory of that morning is how "unpanicked" most people were.

5. Within minutes passengers covered in soot and smoke began staggering from the tunnel, but his main memory of that morning is how long it took the emergency services to arrive – and the smell of burned flesh.