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UMA—Upper Memory Area; UMB—Upper Memory Block; UML—Unified Modeling Language; UML—User-Mode Linux; UMPC—Ultra-Mobile Personal Computer; UMTS—Universal Mobile Telecommunications System; UNC—Universal Naming Convention; UNIVAC—Universal Automatic Computer (By MKS) UPS—Uninterruptible Power Supply or Uninterrupted Power Supply
The memory cell is the fundamental building block of computer memory. The memory cell is an electronic circuit that stores one bit of binary information and it must be set to store a logic 1 (high voltage level) and reset to store a logic 0 (low voltage level). Its value is maintained/stored until it is changed by the set/reset process.
Historical lowest retail price of computer memory and storage Electromechanical memory used in the IBM 602, an early punch multiplying calculator Detail of the back of a section of ENIAC, showing vacuum tubes Williams tube used as memory in the IAS computer c. 1951 8 GB microSDHC card on top of 8 bytes of magnetic-core memory (1 core is 1 bit.)
Static random-access memory (static RAM or SRAM) is a type of random-access memory (RAM) that uses latching circuitry (flip-flop) to store each bit. SRAM is volatile memory; data is lost when power is removed. The static qualifier differentiates SRAM from dynamic random-access memory (DRAM):
Random Access Memory is memory storage that if found in electronic devices such as computers. It holds data while the computer is on so that it can be quickly accessed by the CPU or (Central Processing Unit). [3] Ram is different from regular storage units such as Hard Disks, Solid State Drives, and Solid State Hybrid Drives.
Compression Attached Memory Module (CAMM) is a memory module form factor which uses a land grid array, and developed at Dell by engineer Tom Schnell as a replacement for DIMMs and SO-DIMMs which use edge connectors and had been in use for about 25 years. [1] The first SO-DIMMs were introduced by JEDEC in 1997. [2] [3] [4] [5]
Non-volatile random-access memory (NVRAM) is random-access memory that retains data without applied power. This is in contrast to dynamic random-access memory (DRAM) and static random-access memory (SRAM), which both maintain data only for as long as power is applied, or forms of sequential-access memory such as magnetic tape, which cannot be randomly accessed but which retains data ...
DDR4 is not compatible with any earlier type of random-access memory (RAM) due to different signaling voltage and physical interface, besides other factors. DDR4 SDRAM was released to the public market in Q2 2014, focusing on ECC memory , [ 6 ] while the non-ECC DDR4 modules became available in Q3 2014, accompanying the launch of Haswell-E ...