PC memory

Also found in: Dictionary, Medical, Legal.

PC memory

(1) The main memory in a PC, which is made up of dynamic RAM chips. Definition #2 outlines the structure of memory in a PC, much of which was of importance to users back in the 1980s, but has long since been an issue. See memory module, SDRAM and dynamic RAM.

(2) The original PC design was constrained to one megabyte of memory. In addition, certain parts of the operating system were placed into fixed locations in the upper part of memory without any method for cooperatively storing additional drivers and programs. This design gave rise to the most confusing platform in history. Windows 3.0 became very popular because it handled all of the memory types much better than DOS.

Following are the different types of memory in a PC. In other computers, there is just plain memory. In mainframes and supercomputers, there are also large, auxiliary memory banks that function as caches between disk and RAM. See PC memory map.

Memory Type    Location

 Conventional             First 640K

 UMA (Upper Memory Area)  Next 384K

 HMA (High Memory Area)   Next 64K

 Extended Memory          From 1MB up

 EMS (Expanded Memory)    Early spec
                          (memory above
                           1MB bank
                           into UMA)
References in periodicals archive ?
Solid bit growth in DDR3-SDRAM and DDR4-SDRAM, the dominant types of PC memory, augurs continuing market expansion.
The company's products include PC memory upgrades, computer cases, power supply units, solid-state drives, PC speakers, gaming headsets, gaming keyboards, gaming mice, system monitoring and control devices, PC cooling products, wireless storage drives, and USB flash drives.
Purchase of 1 pc 5 pcs BladeSystem and BladeSystem servers and backup server 1 pc, 1 pc memory system, 1 pc tape library, 30 St.
Dataram, a provider of server, workstation, and PC memory, announced recently the immediate availability of its latest low-cost 4GB upgrade for Sun Microsystems' Sun Blade 1000/2000 and Sun Fire 280R systems, offering customers a cost savings of about 50% over Sun's equivalent product.
The RIMM 4200 uses the 1066 MHz speed bin of current production RDRAM to deliver the highest performance available to date from a single PC memory module," said Tom Quinn, vice president of Marketing, Samsung Semiconductor, Inc.
PNY Technologies supplies Staples customers with solutions for business, mobility, photography, and gaming, including PC memory module upgrades, high-speed, high capacity flash memory cards, USB flash drives as well as consumer and professional graphics cards.
the leading manufacturer of portable computer memory testers, is now shipping the RAMCHECK LX DDR3 memory tester for testing and identifying industry standard 240-pin PC3-6400, PC3-8500, PC3-10600, and PC3-12800 DDR3 (dual data rate) PC memory modules.
Dataram Corporation (NASDAQ:DRAM), a provider of server, workstation, and PC memory, has announced the availability of memory upgrades for HP zx2000 and zx6000 workstations.
New 2Gb Component Enables up to a 16GB Server Memory Module and a 4GB Desktop and Notebook PC Memory Module
Dataram Corporation (NASDAQ:DRAM), a provider of server, workstation, and PC memory, recently announced the industry's first low-profile 1GB memory upgrade for Hewlett-Packard's Compaq AlphaServer DS10L.
The new digital devices take advantage of the high bandwidth of PCI Express and use inexpensive PC memory to increase performance while reducing the overall cost of the board.
In addition, LPDDR2 was designed to allow sharing of SDRAM and NVM memory on the same bus, which is extremely difficult in PC memory technologies.