Specifications

Computer Architecture and Maintenance (G-Scheme-2014)
in-line memory module (RIMM), which is similar in size and pin configuration
to a standard DIMM. What makes RDRAM so different is its use of a special
high-speed data bus called the Rambus channel. RDRAM memory chips work in
parallel to achieve a data rate of 800 MHz, or 1,600 MBps. Since they operate at
such high speeds, they generate much more heat than other types of chips. To
help dissipate the excess heat Rambus chips are fitted with a heat spreader,
which looks like a long thin wafer. Just like there are smaller versions of DIMMs,
there are also SO-RIMMs, designed for notebook computers.
• Credit Card Memory: Credit card memory is a proprietary self-contained DRAM
memory module that plugs into a special slot for use in notebook computers.
• PCMCIA Memory Card: Another self-contained DRAM module for notebooks,
cards of this type are not proprietary and should work with any notebook
computer whose system bus matches the memory card's configuration.
• CMOS RAM: CMOS RAM is a term for the small amount of memory used by
your computer and some other devices to remember things like hard disk
settings -- This memory uses a small battery to provide it with the power it needs
to maintain the memory contents.
• VRAM: VideoRAM, also known as multiport dynamic random access memory
(MPDRAM), is a type of RAM used specifically for video adapters or 3-D
accelerators. The "multiport" part comes from the fact that VRAM normally has
two independent access ports instead of one, allowing the CPU and graphics
processor to access the RAM simultaneously. VRAM is located on the graphics
card and comes in a variety of formats, many of which are proprietary. The
amount of VRAM is a determining factor in the resolution and color depth of the
display. VRAM is also used to hold graphics-specific information such as 3-D
geometry data and texture maps. True multiport VRAM tends to be expensive,
so today, many graphics cards use SGRAM (synchronous graphics RAM)
instead. Performance is nearly the same, but SGRAM is cheaper.
Logical Memory Organization , Conventional , Extended , Expanded Memory ,
Q.Explain the terms conventional , Extended and Expanded Memory
Ans.
The original PCs have total of 1MB of addressable memory and the top 384K of
memory was reserved for the use by the system. Placing this reserved memory space
at the top ( between 640k and 1024k instead at the bottom between 0k and 640k) led to
the what is called as Conventional memory barrier. The different sections of memory in
modern PCs are:
Prepared By – Prof. Manoj.kavedia (9860174297 – 9324258878 ) (www.kavediasir.yolasite.com)
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