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 management.

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.
Specification : - Printing Speed: 12 Ppm A4 Size , Resolution 600 X 600 Dpi, Print Volume : 200 - 800 Pages, Os Supported Windows 98/Me/2000/Xp, Linux, Pc Memory 2 Mb On Board .
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.
1 PC memory maker with revenue exceeding US$210 million in 2010.
Innoventions has announced the RAM-Check DDR2 Series adapter for testing and identifying industry standard 240-pin PC2-3200, PC2-4300, PC2-5300, PC2-5400 and PC2-6400 DDR2 (dual data rate) PC memory modules.
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 16-b analog outputs can be used to generate waveforms with virtually unlimited waveform output length from the PC memory.
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.
The PC side of the Integrated Server had to run OS/2 Warp, which is used to manage access to disk resources and presumably is also used to create virtual expanded memory from PC memory (specs are not given for it) for the S/390 daughter card like the original P/390 did running AIX.
TELECOMWORLDWIRE-(C) 1994-9 M2 COMMUNICATIONS LTD Hypertec, a UK manufacturer of branded PC memory, has received verification from Intel that its PC100 memory designs are compatible with Intel's new 100MHz chip sets.
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.
Or Similar Specification As:-Printing Speed 12Ppm A4 ,Resolution-Enhanced Toner 600X600 Dpi Resolution ,Smoothing Techonology- 2400X600 Dpi Eqivalent With Automatic Image, Printing Langauge-Capt Canon Advanced Printing Techonology ,Memory-Uses Pc Memory Standered 2 Mb On Board ,Varm-Up Timeosec,From Stand By Mode Less Than 10Secs After Power Up ,Frist Print Out Time-9.