0
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.
4,434 Questions
What is the permanent memory built into your computer called?
Permanent memory is non-erasable memory, so the right answer to this question is: ROM (Read Only Memory).
RAM is an acronym for "Random Access Memory", meaning that the computer can write to the memory and later read from it. Computers read information from disk or outside sources such as the internet or peripheral devices, and writes data to the RAM. Typically the RAM is fast memory that allows the computer to read and write the data quickly, allowing applications (programs) to run at high speed. The "Random" nature of the memory means that the computer can write then read or write at any time, randomly as is necessary by the computer operating system or other applications.
Difference between two address instruction and one address instruction?
Two address instructions use registers as operand locations.
Example of a half word length (16 bit) Two address format.
Bits 0-3 OP-Code bits (4 bits 16 different Mnemonics).
Bit 4 instruction type ( e.g. 0 means half word length).
Bit 5 fixed at value 1 used as extension to op-codes.
Bits 6-9 Address A (4 bits refers to a registers hence a total of 16 registers).
Bits 10-11 addressing modes ( 2 bits hence 4 different addressing modes in this case).
Bits 12-15 Address B (4 bits refers to a registers hence a total of 16 registers).
If 16 OP-codes for One address instructions is to be: ADD, ADC, SUB, SBC, XOR, BIT, CMP, INC, DEC, LDA, STA, AND, OR, JMP, BRN, JSR.
For Two address instructions the following 6 OP-Codes are dropped: INC, DEC, STA, BRN, JMP, JSR, but new OP-Codes with the help of bit #5 is introduced instead
------------------------------------------------
now let's to introducing
One Address Instructions
This is for a 32 bit CPU word length.
Bits 0-3 OP Code bits (4 bits 16 different OP Codes).
Bit 4 word length (0/1 Two different length 16 or 32 bit in this case).
Bits 5-7 Addressing Modes (3 bits 8 different Addressing Modes).
Bits 8-31 # of Addresses (2^24 Addressing Options).
The possible OP-Codes could be: ADD, SUB, ADC, SBC, AND, XOR, ORA, BIT, CMP, LDA, STA, INC, DEC, BRN, JSR, JMP.
one addressing
24 bit Address
3 bit AM
1/0
OP Code
two addressing
0000
00
1111
1
0
0010
What is the most amount of memory you can have in a PC?
This varies wildly, and by the definition of 'personal'.
Current motherboards for standard desktops max out at 24 GB for Intel, 32 GB for AMD, and 256 GB for AMD Server boards, as of April 16th 2010.
This changes often, so don't expect it to last long as a fact. Also, I have never once seen a PC user who needed more than 6GB of RAM- I've never seen a PC utilize past the 6GB mark as of yet. However this, too, will change in time.
There's about 46 Intel boards that take 24 GB max. I cannot find any 32GB Intel boards that aren't server boards.
RAM is necessary, because without it you would not be able to run any type of application or program on your desktop such as word processors and spread sheets. You would also not be able to use the internet if there was no RAM, because what RAM does is it holds temporary data from the program or browser you are doing and RAM is what is used to allow you to keep the application open, or to keep the web browser open. so without RAM you would not be able to use the simplest and most important software on a computer.
What type of storage location is a RAM?
Random Access Memory (RAM) is a volatile memory that the computer initially uses. It is quick, but unless the data is saved to the hard drive (or some other stable device), the RAM is wiped clean once the computer is turned off - hence, the term volatile!
What are the disadvantages of random access?
Assuming you're talking about tape storage.. mainly speed ! With sequential access, the medium has to be constantly rewound back to the start before the next relevant data can be accessed. The constant rewinding slows down the access time.
What are the functions of system memory?
the main role of memory is to let OS copy in it.. means when we start PC, 1st OS gets copied on ram.. it also important for software or program..
it is measured in mb
response time is measured in nanoseconds
How many pins are on a DDR DIMM?
- DIMM. Two types of DIMMs: a 168-pin SDRAM module (top) and a 184-pin DDR SDRAM module (bottom). Note that the SDRAM module has two notches (rectangular cuts or incisions) on the bottom edge, while the DDR1 SDRAM module has only one.
What are optical input devices?
Optical inout devices that uses light as a source of input. They eliminate the need for manual entry of data, thus accuracy increases. Three examples of optical input devices are:
1. barcode reader
2. image scanner
3. light pen
Barcode readers convert a barcode (pattern of bars on products) to a code that computers can understand. Image scanners are of two types,flat bed and hand-held. Light pens use a light sensitive detector.
Well I have had several other computers and laptops before. My new Emachines computer that I purchased this week had 1GB DDR2 in it and it has beaten all my other computers and laptops in speed. So I'm guessing it's all thanks to the 1GB DDR2. Well I have had several other computers and laptops before. My new Emachines computer that I purchased this week had 1GB DDR2 in it and it has beaten all my other computers and laptops in speed. So I'm guessing it's all thanks to the 1GB DDR2.
What is the memory write operation?
read/write permissions/privileges allow the user to read, append and delete records from your database tables, however it cannot alter / create / drop the tables and its structures.
Read/write privileges are ideal for forums and production websites that don't require creation or alteration of table structures on its normal operations.
That would depend on several things, among these are:
- The color depth of the image. The RGBA standard requires 32 bits of information per pixel. An 8 bit per pixel image will represent up to 256 separate colors
- Any compression algorithm that the image has bee subject to. JPEG compression destroys image information but gives a smaller image size than PNG compression or an uncompressed BMP (or uncompressed RGBA)
In the case of an uncompressed RGBA image you will have about 250000 pixels in your megabyte of data (a square 500 pixels on a side)
In the case of an 8 bit bitmap you have four times the area or 1000*1000 pixels (minus a little for header overhead etc.)
When it come to images that are compressed (both lossy like JPEG- JPG, or non-lossy like PNG) it depends on the image because it is easier to compress large fields of single colors than complex imagery like details of branches of a tree.
At maximum compression A 1000 *1000 pixel entirely white image weighs in at 4400 bytes as .png and 6100 bytes as jpg.
With random noise spread across the image the .png (no loss of information mind you) weighs in at 1500000 bytes (1,5Mb) While the Jpeg due to maximum compression had no color information left at all but "weighed" only 51700 byte (51.7 kb) With as little compression as possible the file size of a (good looking) jpg was 1473000 (1,47 Mb)
So there are a lot of things to consider!
dual channels
How much ram memory can you put on a dell OptiPlex gx520?
You can upgrade your Dell OptiPlex GX620 SFF upto a maximum of 4.0 GB, with maximum of 1GB per slot in 4 (2 banks of 2) memory slots. The Dell OptiPlex GX620 SFF takes the PC2-4200 DDR2 SDRAM DIMMs. Supports Dual Channel DDR. Memory Type.
What are memory sockets or slots and how are these divided into bank?
Memory Sockets or Slots are the place where memory RAM modules are inserted in the motherboard. The Dell OptiPlex GX620 SFF has 4 (2 banks of 2) memory expansion slots. A memory bank is a group of memory expansion sockets, a bank must be completely filled with memory modules of the same size and type in order for the system to recognize and address the memory. i.e. :
2 sockets (2 banks of 1) This indicates that there are 2 memory slots. These are divided into 2 banks, and each bank consists of one memory slot. So you can add memory one piece at a time for the system to use.
3 sockets (3 banks of 1) This indicates that there are 3 memory slots. These are divided into 3 banks, and each bank consists of one memory slot. So you can add memory one piece at a time for the system to use.
4 sockets (2 banks of 2) This indicates that there are 4 memory slots. These are divided into 2 banks, and each bank consists of two memory slots. So you must add memory two pieces at a time (they must be the same size and type of memory) in order for the system to benefit from the upgrade.
8 sockets (4 banks of 2) This indicates that there are 8 memory slots. These are divided into 4 banks, and each bank consists of two memory slots. So you must add memory two pieces at a time (they must be the same size and type of memory) in order for the system to benefit from the upgrade.
12 sockets (3 banks of 4) This indicates that there are 12 memory slots. These are divided into 3 banks, and each bank consists of four memory slots. So you must add memory four pieces at a time (and they must be the same size and type of memory) in order for the system to benefit from the upgrade.
How do I install memory on my Dell OptiPlex GX620 SFF?
Memory installation help guides can be found at the following link.
Memory Installation Guide
184-pin DDR DIMM Installation Guide
168-pin SDRAM DIMM Installation Guide
If you have a memory card will your picture be in the computer if you delete it?
It depends. Could it be we are talking about the memory card in a digital camera? Generally with the cameras I have used, when pictures are selected to put on to your computer they are not erased from the memory card. If you want them to be (I usually do because I don't want to have to go through the camera itself and delete old pictures one at a time when I need more memory) you can plug in your camera with a cable to your device, go to Computer (on a Windows computer) click the icon for your camera, find the folder where your pictures are stored, highlight them all (Using Control+A if you wish) and then right click on one of the images while they're all highlighted and select "cut" and then go to the folder on your computer you want and right click and slect "paste." Alternately, a safer way (in case something goes wrong with the file transfer) is to highlight the pictures listed in your camera's folder, right click, select "copy" and then go to your computer to the appropriate folder, right click, and select "paste." Then once the transfer is complete and you're sure the images open up and display okay you can return to the other folder with the images on your camera and push "delete."
Why CPU and memory are not connected directly with peripheral devices?
If they were, the devices would all have to have a separate interpreter for the processor and in order to communicate amongst themselves they'd have to go through the processor, which would slow the computer down. If everything is connected to the motherboard and the motherboard interprets everything for the processor, it's cheaper and faster.
Yes, but they are slightly larger (for now) than the "thumb drive" versions.
As of 2011, the price for large-scale flash drives has continued to come down. Some 256Gb drives fell to less than $700 USD, and modifications can be made to existing drives to allow 1 terabyte of data storage. The price for an actual 1 Tb drive (solid-state drive) was still in the $3000 USD range in early 2011.
