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How computer RAM at work

RAM is also used to store instructions on the applications that implementation.
For example, when you start a computer game, a large number of game instructions
(For example, how it works, how the screen should be similar, which sounds must be
generated) is loaded into memory. The processor can retrieve the instructions
RAM much faster than they can from the hard disk, where the game normally
is to get you started. Within limits, most information is stored
in memory, the computer work anymore. In fact, one of the most common
Equipment upgrades to increase the amount of RAM.
The information contained in RAM is constantly being read, modified and eliminated. There
as volatile, which means it can not function without a constant supply. When
the computer is off, the information contained in RAM is lost.
Remember that when a user makes a request is intercepted by the processor, then
organizes the application in the component tasks specific. Many of these tasks must take place
a specific order, each component of a report thereon by the processor
the next task can be out. The processor uses RAM to store the results until
that can be compiled into the final result (s).
Many desktop components such as CPU, power, and RAM are installed
through the physical addiction to the computer simple. That is, the physical installation is
everything needed to make the component functional. Other devices such as hard
readers and keyboards, require the allocation of additional system resources. In this section
focuses on the installation physical components, the allocation of resources is
equipment in question in the next section, "IRQ, DMA and I / O addresses." Special
configurations are discussed in Chapter 2.

Memory
The first RAM chip dual-line packages (DIP) that attach directly plug in
on the motherboard. However, its design makes it more likely to loosen due to
alternate heating and cooling system board. recent memory modules are actually
small cards with chips dip on one or both sides. These cards fit into the vertical slots in the
board system and is maintained in place by clips that keep chips "Creep" (release).
RAM is automatically detected and counted at the beginning if the facility is limited
physical location on your computer. That is, once the memory is physically installed RAM,
no additional configuration is required. When the memory by installing a motherboard,
verify the type and amount of memory on the motherboard can accept.
SIMM single inline memory module (SIMM) Memory is available
in 30 – and 72-socket configurations. Most of the 80386, 80486 and Pentium
computer slots for both types of SIMM. Follow steps 1-5 of the year
to install SIMMs.
However, the new drives can access the RAM aa
directly using a protocol known as Ultra DMA (UDMA). UDMA is a protocol used only
by hard drives and are not associated functionally in the DMA standard equipment
channels.

As you know by heart, a function of RAM is the processor to provide faster access to
information you need. Within limits, the more memory a computer has, faster is
Run. An equipment upgrades is the most common installation of more RAM.
Remember that most computers can use one another RAM type called cache.
chip cache can be accessed even faster than normal RAM, so its presence
can help speed up your computer. In general, the larger the cache of a computer faster
will take place. The type of cache can be added to the computer is called Level 2 (L2)
cache and can be installed in places available on the motherboard.

Additional RAM can be added to a transportation system in a number of ways. Some systems
include RAM slots in the extra frame. This type requires you to open the
computer case and replace the RAM module in an available slot (see Figure 2-14).
Due to the RAM modules for laptops are proprietary, not be used in the office
laptops or other.
An easy way to add more RAM to your laptop is using a PC memory card.
PC cards have been described as small cards that can be easily inserted a
laptops to improve or expand its capabilities. In fact, PC cards originally PCMCIA
all cards to add more memory. PCMCIA is for personal use
Computer Memory Card International Association, a little misleading as these
The cards are usually used in laptops, not PC (desktop).
Processor and memory symptoms
In most cases, the processor and memory problems are fatal, which means that when there
as a problem, the team did not go. However, you should be aware
nonfatal error indicators. As described, the error codes are 1 ** Typical Processor
problems and error codes ** 2 are typical of memory problems.
If you turn on your computer and even post or not
nothing and has eliminated the feeding problems, might be a problem
with the processor or memory. The solution to a problem of processor or memory
remove the defective component and replace it with a new one. If the error persists,
could be a problem with the slot or plug in memory or processor uses
to connect to the motherboard. In this case, the board must be replaced.
On a final note: Some RAM errors are not reported by the computer at all. Who
is a memory module If things do not work, the team can simply ignore it and
continue to function normally without the RAM it.Watch count on the screen
prompt to make sure that corresponds to the total installed capacity in the
machine. If this amount is significantly less in place, you probably need to replace
Memory module.
memory problems may not cause a system failure to appear at all.
Most modern systems to ignore only a memory card has not worked properly
and normal operations continue. The user can signal the loss of performance,
which is a key symptom of failure memory card.
Random Access Memory
The main function of the RAM is to provide a temporary storage of information
in devices and applications. However, there are many types of RAM with which
You should be familiar. This section covers the many incarnations of RAM, as
have developed and refined over time. This section also important factors
to consider when you install or upgrade the RAM in a computer system: no
should follow the guidelines on the type of RAM, type of packaging and quantities
RAM is installed on a particular system.

Type RAM
RAM is not the same. Over time, the RAM memory technology has improved, changed, and
have been used for specialized components. Types RAM most common are discussed here.
SRAM
Static RAM (SRAM) was the first type of RAM. SRAM can be accessed
10 nanoseconds (ns), which means it takes about 10 ns for the CPU
receive the requested information to SRAM. The structure of SRAM chips limits
enter a maximum capacity of 256 KB of data. Although SRAM is very fast compared
with DRAM, it is also very expensive. Therefore, SRAM is typically used only for
caching system.

DRAM
Dynamic RAM (DRAM) has been developed to combat the restrictive measures at the expense of aid
SRAM. DRAM chips provide more access slower than SRAM chips, but can store
many megabytes of data on a single chip (or hundreds of megabytes if packaged
together in a module). Each cell "in DRAM chip contains a transistor and
capacitor to store one bit of information. This design makes it necessary for
DRAM chips to receive an update constant power of computers to prevent
capacitors lose their charge. This constant updating can make access even more slowly
and makes the chip DRAM memory to get more computing power than SRAM
chip. Because of its low cost and high capacity of DRAM is used as a "principal" in memory
equipment.
The term DRAM is generally used to describe any type of memory used
The technology has been described. However, the first DRAM chips were very low (~ 80-90ns)
variations therefore have developed faster. The list is extensive and includes quick paging
RAM, EDO RAM, SDRAM, RDRAM, SDLRAM and BEDO RAM. As a team
Improve the systems, the list of DRAM technologies is growing. However, EDO,
SDRAM, RDRAM and DDR RAM is currently the most common are
described here.

EDO RAM
extensive data on the (EDO) DRAM RAM improvement over traditional performing
one task at a time. When a piece of data is sent to the processor, another
Shall be recovered from the RAM module. Well this piece of data transfer
EDO RAM are looking for the next piece to reach the processor. This process
allows the chip can access data about 60ns. EDO RAM chips can be used
in a computer system with a processor and motherboard support its use.

SDRAM
SDRAM or Synchronous Dynamic RAM, is approximately twice faster than EDO RAM, as
is capable of operating the system bus speed (100-133MHz). However, as faster
system bus speeds develop, EDO and SDRAM are replaced by other
faster DRAM types, such as RDRAM and DDR RAM. Like EDO RAM, SDRAM
can be used in systems support it.

RDRAM
RDRAM (Rambus Dynamic RAM) takes its name from the company that developed
he uses Rambus Inc. Rambus RDRAM a special string that has a data transfer
rate of 800 MHz channel width can be doubled, resulting in a 1.6GHz data
transfer! RDRAM can used only on computers with special channel RDRAM
and slots. RDRAM is relatively new, so do not wait to see computers have
manufactured before 1999.
DDR RAM
Double data rate (DDR) RAM doubles the rate of speed at which standard SDRAM
can process the data. This means that the DDR is about twice the standard speed of RAM.
The standards available for PC 1600 DDR RAM is PC 2100 and PC2700. This
new label refers to the total bandwidth of memory, unlike the former
standard, which specifies the level of speed (in MHz) SDRAM memory in this
case, the PC66, PC100, PC133 y. The numerical value of PC66, PC100,
PC133 and refers to the memory runs at the speed MHz
VRAM
Video memory (VRAM) is a specialized type of memory used only video
adapters. The video card is one of the most active components of the computer to keep up
video requirements, adapters many have an onboard microprocessor and micro-
special video memory. The adapter can handle applications independently, then the CPU
store CPU performance in the VRAM until recovery. VRAM is much faster than
EDO RAM and is likely to be read and write at the same time. The
result is better and fast video performance. Because it has more VRAM circuit
regular DRAM Video RAM modules are slightly larger.
The video memory term refers both to a particular type of memory and a generic
for all the RAM used by the video card (such as DRAM term that is often
used to all types of memory are dynamic). faster versions of video memory
Have been introduced, including WRAM.
WRAM
Window RAM (WRAM) is another type of video RAM, but provides faster access
VRAM that. It uses the same technology that allows devices Dual Port read
video memory write data simultaneously. The term "window" refers to

Physical
RAM types discussed so now, can have many different physical forms. Your system
must support both technology and form memory module. The system must
We also support the width of data memory and its error correction mode.
The following paragraphs describe some common forms of physical memory modules
and other features that distinguish one module to another.
Single line Memory Modules
The first memory chip dual in-line package (DIP) chips, which were inserted
directly on the motherboard. But as explained in Chapter 1, the structure
was subject to the influence of the chip. Individual Inline Memory Modules (SIMM) is
developed to combat this relaxation of the memory chips and reclaim space on the
motherboard.
SIMMs are available 30-pin and 72 pin forms. Thirty-pin SIMM is 8-bits
which means that data can be transferred to or from the form of 8 bits at a time.
Sixty-two-pin SIMMs are 32-bit. For SIMMs that are older technology, are
typically used for quick paging and EDO RAM. No more likely to find SIMM
SDRAM memory modules of two lines (DIMM) were the common form
when introduced SDRAM.
Memory Modules Dual Inline
Module Dual Inline Memory (DIMM) modules like arrangement, but are a little
more time and moved into a different kind of slot. DIMM have two rows of connectors,
168 to all connectors, and are 64 bits. Are likely to contain DIMM EDO RAM
or because these technologies étaient SDRAM common when the DIMMs were introduced.
Rambus Inline Memory Module
Rambus Inline Memory Module (RIMM) is designed specifically for use with
Rambus memory. DIMM RIMM similar but they have 184 slots. Them
It is also more exclusive and less frequent than Simms and DIMM. RIMM is 16-bit.
Small DIMM
Small Outline DIMM (SODIMM) is a memory module used in notebook computers.
The physical size is much smaller than the memory DIMM. The most common pin
configurations of 72 – and 144-pin modules.

Equality and non-parity chips
A type of memory error checking is called parity. In parity, each byte is Data
with a ninth bit (the parity bit), which is used by the receiver, which
determine the presence of data errors. There are two types of parity: odd and
same. In odd parity, the parity bit is used to ensure that the total number of 1 data
the flow is odd. For example, suppose a byte is composed of the following data: 11,010,010.
The number of these data is 1 in 4, an even number. The ninth bit is 1,
ensure that the total number of 1s is odd: 110,100,101.
Even parity is the opposite of odd parity ensures that the total number of 1s is
same. For example, suppose a byte is composed of the following: the Ninth 11001011
bits would be 1 to ensure that the total number of 1s is 6, an even number.
Parity is not a lack of evidence. Suppose the data stream contains two previous
error: 101,100,101. If the team has been using the odd parity, the error would go through
(Evidence; 1s counted.) However, parity is routine and not inhibit the rapid
access time of the memory of how they would be more sophisticated error checking routine.
Some memory modules also parity. These modules include an additional bit
parity for every 8 bits of data. Therefore, a 30-pin SIMM no parity, 8 bits;
with the parity bit is 9. A non-parity DIMM is 64 bits, parity, DIMM
Additional 8 bits (1 bit parity per 8 data bits). Therefore, a DIMM with parity
64 + 8 = 72 bits. If your system is compatible with parity, you must use parity memory modules.
You can not use parity memory if your system supports it.

If more than one port on the computer printer (LPT1 and 2 or more
USB ports), try the printer in another port or another computer. Look
Printer Setup in the operating system to make sure the printer is the type of joints
selected in the printer settings in the area. Finally, this problem could be the result of
Not enough memory printer. You can test this hypothesis, trying to print a
small document. If it works, there are good possibilities that the original document was
too large for the printer memory. You can add more RAM to the printer using the
same modules as the computer uses (SIMM or DIMM).

The first RAM 640KB of conventional memory have traditionally been used
for applications that run and own operating system (DOS). This area memory was originally
memory system call. System Memory "now refers to any memory
available in the system.
High memory 384KB The rest of memory are set aside (reserve) for
BIOS ROM and RAM and ROM is installed on devices. Applications
could not access this memory space, even if not fully used by the system.
This report was initially called reserved memory. It is very common for
devices such as video cards use some of this memory for their purposes.
Scope and memory high When the spreadsheet application Lotus 1-2-3
was released, users are often took more than 640KB of memory. In
solve the problem of memory of 1 MB barrier, Lotus, Intel and Microsoft have joined forces
and develop the specification LIM memory. In this specification of system memory,
was called conventional memory and reserved memory renamed upper memory.
More important, however, has been the development of a memory manager that has
applications use more than 1 MB of memory (called extended memory). The manager, a file
HIMEM.SYS call could also load the operating system in the first 64K of extended memory
an area called the high memory area (HMA).
For use the extended memory specification (XMS) HIMEM.SYS must reference
in the CONFIG.SYS file as shown here:
DEVICE = C: DOSHIMEM.SYS
DOS = HIGH
First line tells the computer to locate and initialize the file HIMEM.SYS,
allowing the area of extended memory. The second charge DOS in the high-
memory area (HMA).
Expanded memory when LIM production specifications, many users
Intel's 8088 and 80286 computers, which, due to the small memory
address bus, could not be made for access to more than 1 MB of memory. For these people
specification LIM includes an extended memory manager that can "fool" the
Prolonged use of memory chip. In the 80386 processor, a file called EMM386
. EXE is able to share memory between the pages of expanded memory and upper memory.

Now you can buy your memory RAM Test Pro software and pay with PAYPAL .

José Roberto Simoes

About the Author

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