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Computer Memory
The computer memory is a physical device used to store data or programs for use in a computer. Some types of computer memory include RAM (random access memory), ROM (read-only memory), and page cache.
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Types of DIMMs are DDR3 and DDR2 that have 240 pins, DDR DIMMs with 184 pins and SDRAM DIMMs with 168 pins.
A byte is a sequence of 8 bits (enough to represent one alphanumeric character) processed as a single unit of information. A single letter or character would use one byte of memory (8 bits), two characters would use two bytes (16 bits).
Put another way, a bit is either an 'on' or an 'off' which is processed by a computer processor, we represent 'on' as '1' and 'off' as '0'. 8 bits are known as a byte, and it is bytes which are used to pass our information in it's basic form - characters.
An alphanumeric character (e.g. a letter or number such as 'A', 'B' or '7') is stored as 1 byte. For example, to store the letter 'R' uses 1 byte, which is stored by the computer as 8 bits, '01010010'.
A document containing 100 characters would use 100 bytes (800 bits) - assuming the file didn't have any overhead (additional data about the file which forms part of the file). Note, many non-alphanumeric characters such as symbols and foreign language characters use multiple bytes.
A kilobyte (KB) is 1024 bytes, a megabyte (MB) is 1024 kilobytes and so on as these tables demonstrate.
1024 Bytes = 1 Kilobyte, 1024 Kilobytes = 1 Megabyte, 1024 Megabytes = 1 Gigabyte, 1024 Gigabytes = 1 Terabyte, 1024 Terabytes = 1 Petabyte, 1024 Petabytes = 1 Exabyte, 1024 Exabytes = 1 Zettabyte, 1024 Zettabytes = 1 Yottabyte
The yottabyte (derived from the SI prefix yotta-) is a unit of information or computer storage equal to one septillion (one long scale quadrillion or 1024) bytes (one quadrillion gigabytes). The unit symbol for the yottabyte is YB.
As of 2012, no storage system or network has achieved even one thousandth of a yottabyte (a zettabyte) of information. The combined space of all computer hard drives in the world was estimated at approximately 160 exabytes in 2006, and as of 2009, the Internet was estimated to contain close to 500 exabytes.
When used with byte multiples, the SI prefix indicates a power of 1000: 1000000000000000000000000bytes = 10008 or 1024 bytes
The term "yobibyte" (YiB), using a binary prefix, is used for the corresponding power of 1024.
What happens if you boot up a PC without any RAM installed?
The computer most likely will not boot,RAM is how data gets from point a to point b, if theres no highway for data to travel(RAM) how can the computer boot?
Can I replace a 800 MHz RAM module with 667 MHz RAM module?
Yep, Sure can....
If you aren't having any problems with the 800 MHz module then keep it over the 667MHz =)
There is no such number because numbers has no limit.
Normal person's computer, maybe 1-2 gigabytes of RAM. Most in the world is 80 terabytes - at a cost of nearly $5 million US. I think
#2.) I am pretty sure that the biggest so far is a brontobyte, but like the person before me said, there is no limit because numbers never stop. **9-5-2008**
#3.) The biggest byte of memory is called a Geopbyte. It consists of 1000 Brontobytes. We don't know why this term was created though, because nobody alive today will ever see a geopbyte of memory.
More information:
1 Brontobyte = 1000 Yottabytes 1 Yottabyte = 1000 Zettabytes 1 Zettabyte = 1000 Exabytes 1 Exabyte = 1000 Petabytes 1 Petabyte = 1000 Terabytes 1 Terabyte = 1000 Gigabytes 1 Gigabyte = 1000 Megabytes 1 Megabyte = 1000 Kilobytes 1 Kilobyte = 1000 Bytes
Source: http://www.whatsabyte.com 8/3/2008
4)
Bit
Byte,
Kilobyte,
Megabyte,
Gigabyte,
Terabyte,
Petabyte,
Exabyte,
Zettabyte,
Yottabyte,
Brontobyte,
Geopbyte,
Sagnabyte
dogbyte
sharkbyte
mybyte (this one hurts)
mosquitobyte
bigbyte
giantbyte
lankybyte
fatbyte
foodbyte
5) the biggest so far is a kryatbyte it is 1000 Saganbyte
Edit By Hagefade
It goes:
Bit
Byte
Kilobyte
Megabyte
Gigabyte
the biggest I've ever seen was a zettabyte.
here are some comparisons to help you understand why nobody needs to know "bytes" this large.
(a brontobyte his 10000000 times bigger than a zetta byte)
1 zettabyte =
80 times the information content of ---> all<--- human knowledge
11000 times the estimated data content of the whole web
It used to be lots of space some decades back. But today 844kb just means:
- 20-30 documents.
- 3-4 images.
- even an HD photo takes 2-5 mb.
- very low quality 20 minutes video.
- boring 2-d games that your dad used to play in his childhood!
- 1 complete webpage.
How are the characteristic a ROM chip different from those of a RAM chip?
A RAM Chip (Random access memory) loses it's stored information when power is lost. A RAM chip can have data written to it.
A ROM Chip (Read Only memory) does not lose it's information when power is lost, but it cannot be written to*
* There are different types of ROM...
ROM (Read Only memory) gets "burned" and cannot be changed.
PROM (Programmable Read Only Memory) (not sure if they're used much any more) can be erased by exposing to ultra-violet light and re-programmed.
EPROM (Electrically Programmable Read Only Memory) - can be re-written electrically with special software.
In Visual Basics this is known as a Variable
Who discover the photographic memory?
Photographic memory, or eidetic memory, is not attributed to a single discoverer but is a term used to describe the ability to recall images, sounds, or objects with high precision. The concept has been studied by various psychologists and researchers over the years, including Sir Francis Galton in the 19th century, who examined the phenomenon. However, it remains a debated topic in psychology, as true photographic memory is extremely rare and not fully understood.
What is semiconducter memories?
Definition: A device for storing digital information that is fabricated by using integrated circuit technology. Also known as integrated-circuit memory; large-scale integrated memory; memory chip; semiconductor storage; transistor memory.
Semiconductor memory is an electronic data storage device, often used as computer memory, implemented on a semiconductor-based integrated circuit. Examples of semiconductor memory include non-volatile memory such as Read-only memory (ROM), magnetoresistive random access memory (MRAM), and flash memory. It also includes volatile memory such as static random access memory (SRAM), which relies on several transistors forming a digital flip-flop to store one bit, and dynamic random access memory (DRAM), which uses one capacitor and one transistor to store each bits. Shift registers, processor registers, data buffers and other small digital registers that have no memory address decoding mechanism are not considered as memory.
Data is accessed by means of a binary memory address to the memory. If the memory address consists of M bits, the address area consists of two raised by M addresses per chip. Semiconductor memory are manufactured with a certain word length (number of 1-bit cells sharing the same memory address) that power of two, typically M=1, 2, 4 or 8 bit per chip. Consequently, the amount of data stored in each chip is MN2 bits. Possible figures are 1, 2, 4, 8, 16, 32, 64, 128, 256 and 512 bit, kbit, Mbit, Gbit and Tbit, here defined by binary prefixes. By combining several integrated circuits, memory can be arranged for a larger word length and/or address space than what is offered by each chip, often but not necesserily a power of two.
When you open a file it is copied into RAM so that you can view and work on it?
Sort of - certainly to work on it, it or bits of it must be in RAM.
How do you use opcode and operand?
The hard way: Download the processor manuals and code the opcode and operands by hand
The easy way: Use an assembler program. The instructions are slightly different for each program, so try reading the manuals.
There are lots, too many to name. Some of the popular ones are: EDO (Obsolete) SDRAM (Mostly Obsolete) RAMBUS (Obsolete) - Data transfers fast, but takes a long time to find. Only used on P4 systems. DDR/DDR2/DDR3 - Current technology. Basically a pumped up version of SDRAM GDDR2 - An early version of DDR2, only used on graphics cards.
