Computer memory Computer memory 1T DRAM is a memory technology that uses 1 transistor and 1 capacitor for memory cell. ...more on Wikipedia about "1T DRAM"
1T-SRAM is a trademarked term owned by MoSys for the 1T DRAM technology which they developed. In development since the early 1990s, the goal of the product was to combine the speed of SRAM with the capacity and price of DRAM. The new 1T-SRAM has very low power consumption, has the speed and functionality of SRAM, and allows for the density of DRAM. 1T-SRAM is currently being marketed as IP for SOC developers. ...more on Wikipedia about "1T-SRAM"
The A20 handler is IBM PC memory manager software controlling access to the High Memory Area. Extended memory managers usually provide this functionality. A20 handlers are named after the 21st address line of the microprocessor, the A20 line. ...more on Wikipedia about "A20 handler"
An absolute address in computing is the precise indication of a memory location without the use of any intermediate reference. ...more on Wikipedia about "Absolute address"
In computing, an address space defines a context in which a memory address makes sense. ...more on Wikipedia about "Address space"
Bank switching (also known as "paging", but only loosely related to the ordinary meaning of " paging" in computing) was a technique common in 8-bit microcomputer systems, to increase the amount of addressable RAM and ROM without extending the address bus. ...more on Wikipedia about "Bank switching"
In computing, a base address denotes a memory address serving as a reference point ("base") for other addresses. To specify an absolute address, the relevant base address is added to an offset (aka displacement). This way of determining a memory address is called relative addressing. ...more on Wikipedia about "Base address" Evergreen shortopedia!!!
Bubble memory is a type of computer memory that uses a thin film of a magnetic material to hold small magnetized areas, known as bubbles, which each store one bit of data. Bubble memory was a very promising technology in the 1970s, but flopped commercially when hard disks proliferated in the 1980s. ...more on Wikipedia about "Bubble memory"
In computer science, a cache (pronounced kăsh) is a collection of data duplicating original values stored elsewhere or computed earlier, where the original data is expensive (usually in terms of access time) to fetch or compute relative to reading the cache. Once the data is stored in the cache, future use can be made by accessing the cached copy rather than refetching or recomputing the original data, so that the average access time is lower. ...more on Wikipedia about "Cache"
COAST, an acronym for Cache On A STick, is a packaging standard for modules containing SRAM used as an L2 cache in a computer. COAST modules look like somewhat oversided SIMM modules. COAST modules were somewhat popular in the early 1990s, but as of 2004, most cache is build-in to either the CPU or the motherboard. ...more on Wikipedia about "Cache On A STick"
Content addressable memory, or CAM, is a special type of computer memory used in certain very high speed searching applications. ...more on Wikipedia about "Content-addressable memory"
Conventional Memory is the first 640 kilobytes of an IBM PC's memory. Prior to extended memory such as EMS, XMS, and HMA, real mode applications could use only this part of the memory. Even when extended memory is present, real-mode applications have to be specially programmed to use it using a complex system of overlays; consequently, many applications continued to use only conventional memory. ...more on Wikipedia about "Conventional memory"
Core rope memory is a form of read-only memory (ROM) for computers, first used by early NASA Mars probes and then in the Apollo Guidance Computer (AGC) designed by MIT and built by Raytheon. ...more on Wikipedia about "Core rope memory"
A CPU cache is a cache used by the central processing unit of a computer to reduce the average time to access memory. The cache is a smaller, faster memory which stores copies of the data from the most frequently used main memory locations. As long as most memory accesses are to cached memory locations, the average latency of memory accesses will be closer to the cache latency than to the latency of main memory. ...more on Wikipedia about "CPU cache"
DDR SDRAM or double-data-rate synchronous dynamic random access memory is a type of memory integrated circuit used in computers. It achieves greater bandwidth than ordinary SDRAM by transferring data on both the rising and falling edges of the clock signal ( double pumped). This effectively nearly doubles the transfer rate without increasing the frequency of the front side bus. Thus a 100 MHz DDR system has an effective clock rate of 200 MHz when compared to equivalent SDR SDRAM, the “SDR” being a retrospective designation. ...more on Wikipedia about "DDR SDRAM"
DDR2 SDRAM (Double Data Rate Two Synchronous Dynamic Random Access Memory) is a computer memory technology. It is a part of the SDRAM family of random access memory technologies, which is one of many DRAM implementations. ...more on Wikipedia about "DDR2 SDRAM"
DDR III, likely to be called DDR III SDRAM (Double Data Rate Three Synchronous Dynamic Random Access Memory), is the name of the new DDR memory standard that is being developed as the successor to DDR2 SDRAM. ...more on Wikipedia about "DDR3 SDRAM"
Delay line memory was a form of computer memory used on some of the earliest digital computers, such as the EDSAC and UNIVAC I. ...more on Wikipedia about "Delay line memory"
A DIMM, or dual in-line memory module comprises a series of random access memory integrated circuits mounted on a small, modular printed circuit board designed for use in personal computers. DIMMs began to replace SIMMs (single in-line memory modules) as the predominant type of memory module when Intel's Pentium processors were in the mainstream market. ...more on Wikipedia about "DIMM"
Direct memory access (DMA) allows certain hardware subsystems within a computer to access system memory for reading and/or writing independently of the CPU. Many hardware systems use DMA including disk drive controllers, graphics cards, network cards, and sound cards. ...more on Wikipedia about "Direct memory access"
Drum memory was an early form of computer memory that was widely used in the 1950s and into the 1960s, invented by G. Taushek in 1932 in Austria. For many machines, a drum formed the main working memory of the machine, with data and programs being loaded on to or off of the drum using media such as paper tape or punch cards. Drums were so common that the machines were often referred to as drum machines. Drums were later replaced by core memory, which was faster and had no moving parts, and which lasted until semiconductor memory entered the scene. ...more on Wikipedia about "Drum memory"
Dual-ported RAM (DPRAM) is a type of Random Access Memory that allows multiple reads or writes to occur at the same time, or nearly the same time, unlike single-ported RAM which only allows one access at a time. ...more on Wikipedia about "Dual-ported RAM"
In computer science, a dword is a unit of data that is twice the size of a word and half the size of a qword. On the x86 platform, this unit of data would be 32 bits. ...more on Wikipedia about "Dword"
Dynamic random access memory (DRAM) is a type of random access memory that stores each bit of data in a separate capacitor. As real-world capacitors are not ideal and hence leak electrons, the information eventually fades unless the capacitor charge is refreshed periodically. Because of this refresh requirement, it is a dynamic memory as opposed to SRAM and other static memory. Its advantage over SRAM is its structural simplicity: only one transistor and a capacitor are required per bit, compared to six transistors in SRAM. This allows DRAM to reach very high density. ...more on Wikipedia about "Dynamic random access memory"
(EDRAM) A high-speed DRAM chip developed by Ramtron International Corporation, Colorado Springs, CO. It allows overlap of a read at the trailing end of a write operation to obtain its speed. ...more on Wikipedia about "EDRAM"
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