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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.
4,434 Questions
How many 8 bit characters does the ASCII standard define?
128 (0-127), 95 printable, 33 control (for 7 bit ascii that is a through back to teletypes.)
ISO 8859-1 has 256 characters.
From 128 up to 255 we find extra symbols for other languages and regions. Ascci 128 = € for instance and 255 = ÿ.
Of course there are many 8-bit standars, windows-1250, for an example.
What is the function of optical isolation in plc processor?
To protect the low voltage electronic components in the PLC from High Voltages/Currents such as in voltage spikes.
RAM holds data and program for processing data?
RAM is volatile storage that holds the program and data that the CPU would be processing.
If you want to change the RAM slots, you need to change the motherboard.
What are the Memory types used in the 8051 microcontroller?
The memory types are : On-Chip Memory, External Code Memory, and External RAM.
On-Chip Memory refers to any memory (Code, RAM, or other) that physically exists on the microcontroller itself. On-chip memory can be of several types, but we'll get into that shortly.
External Code Memory is code (or program) memory that resides off-chip. This is often in the form of an external EPROM.
External RAM is RAM memory that resides off-chip. This is often in the form of standard static RAM or flash RAM.
Code Memory
Code memory is the memory that holds the actual 8051 program that is to be run. This memory is limited to 64K and comes in many shapes and sizes: Code memory may be found on-chip, either burned into the microcontroller as ROM or EPROM. Code may also be stored completelyoff-chip in an external ROM or, more commonly, an external EPROM. Flash RAM is also another popular method of storing a program. Various combinations of these memory types may also be used--that is to say, it is possible to have 4K of code memory on-chip and 64k of code memory off-chip in an EPROM.
When the program is stored on-chip the 64K maximum is often reduced to 4k, 8k, or 16k. This varies depending on the version of the chip that is being used. Each version offers specific capabilities and one of the distinguishing factors from chip to chip is how much ROM/EPROM space the chip has.
However, code memory is most commonly implemented as off-chip EPROM. This is especially true in low-cost development systems and in systems developed by students.
External RAM
As the name suggests, External RAM is any random access memory which is found off-chip. Since the memory is off-chip it is not as flexible in terms of accessing, and is also slower. For example, to increment an Internal RAM location by 1 requires only 1 instruction and 1 instruction cycle. To increment a 1-byte value stored in External RAM requires 4 instructions and 7 instruction cycles. In this case, external memory is 7 times slower!
What External RAM loses in speed and flexibility it gains in quantity. While Internal RAM is limited to 128 bytes (256 bytes with an 8052), the 8051 supports External RAM up to 64K.
On-Chip Memory
As mentioned at the beginning of this chapter, the 8051 includes a certain amount of on-chip memory. On-chip memory is really one of two types: Internal RAM and Special Function Register (SFR) memory.
the 8051 has a bank of 128 bytes of Internal RAM. This Internal RAM is found on-chip on the 8051 so it is the fastest RAM available, and it is also the most flexible in terms of reading, writing, and modifying its contents. Internal RAM is volatile, so when the 8051 is reset this memory is cleared.
The 128 bytes of internal ram is subdivided as shown on the memory map. The first 8 bytes (00h - 07h) are "register bank 0". By manipulating certain SFRs, a program may choose to use register banks 1, 2, or 3. These alternative register banks are located in internal RAM in addresses 08h through 1Fh.
Bit Memory also lives and is part of internal RAM. We'll talk more about bit memory very shortly, but for now just keep in mind that bit memory actually resides in internal RAM, from addresses 20h through 2Fh.
The 80 bytes remaining of Internal RAM, from addresses 30h through 7Fh, may be used by user variables that need to be accessed frequently or at high-speed. This area is also utilized by the microcontroller as a storage area for the operating stack. This fact severely limits the 8051s stack since, as illustrated in the memory map, the area reserved for the stack is only 80 bytes--and usually it is less since this 80 bytes has to be shared between the stack and user variables.
How many Petabytes in a 3024 Gigabytes?
0.003024 PB = 3024 GB
Just for a better estimate, it is closer and more accurate to say it is about 3.024 TB. One Terabyte is HUGE, let alone a Petabyte. But you should look up a YottaByte (YB)!
Is cache a block of high speed memory?
Yes ,i think cache memory is very fast memory in conputer system.
What type of memory traps the charge so that the contents are not lost when power is turned off?
flash memory
The only weakness of RAM is that it is volatile; it has to be refreshed millions of times a second in order to maintain state. If power is lost, the entire contents of RAM are lost. However, this volatility is necessary because RAM is many times faster than any non-volatile alternative such as solid-state memory.
A single-sided, single layer DVD can hold 4.7GB of data, whereas a single-sided, dual-layer can hold 8.5GB. Double-sided, single-layer holds 9.4GB and double-sided, dual-layer holds 17.1GB. So anyone of these combinations can hold a 4.7 ISO image although the single-sided, single-layer may be a tight fit. I would use the single-sided, dual-layer and you won't have any problem. An ISO is simply an exact duplicate of someting (like a Linux operating system) so you will be ok. Hope this helps.
How many characters will be in Brawl?
Alltogether, there will be 35 playable characters (may or may not count Zero Suit Samus there is a cheat code to start out as her, for nunchuk hold z for the entire time: she isn't on the Character Selection Screen). Several are unlockable. You do NOT start with Sonic and Snake in the Character Selection Screen. For more information on the Brawl, check www.smashbros.com. I'm a user of zero suit samus so I will lend you a tip on the game cube controler hit R or L and you can start as her and if you are daring enough taunght up and down on the game cube controller. Its fun to go from samus to zero suit mode and chunk armer and take names that is: with computered players.
It's called a Miguel
What is the relationship between memory cells bytes and bits?
Memory Cells are a physical arrangement of transistors and wires on a memory chip, used to house only 1 bit. A bit is used to describe when the transistor is OFF or ON. One byte consists of a total of 8 bits.
How did you synchronize 2 hard drives?
It is possbile under a program called RAID. Do some research on it, cause there is RAID 0, RAID 1, etc. But basically your hard drive is set up to write data to both hard drives at the same time. Or, you could make an exact copy of your hard drive using the program from Ghost, and copy it on the second hard drive.
How many megabytes are in 100 megabytes?
100, 104.858, or 95.367, depending on if you mean decimal to decimal, binary to binary, decimal to binary, or binary to decimal. Simply, decimal megabytes, used by the storage industry, is 1,000KB, where each KB is 1,000 bytes. Binary megabytes, used by programmers (such as Microsoft, Linux, etc) are 1,024 KB, where each KB is 1,024 bytes (2^10, or 0x0200). Converting from decimal to binary will yield a smaller number of megabytes, while converting from binary to decimal will result in more megabytes.
If you're running Windows Vista, just go into the Control Panel, System, and check the ranking. Otherwize, yes, it is a fast system.
Where is the RAM located in a Toshiba 460cdt and how do you get to it?
Hi, to get to the RAM you must remove the battery cover and battery and remove the floppy or CD drive, in the space where those two were is a screw hole, remove those two screws and also the one in the middle of those two. Flip the laptop back up the right way, and the panel that the mouse buttons are on will lift up, the slot for external ram is under there. I'm not 100% sure how you go about installing the RAM it may be plug & play.
What are high memory RFID chips?
High memory RFID chips are ones that have more memory than the commonplace 768 bits (256 EPC plus 512 bits of user memory). High memory RFID requires high amounts of memory because its use case is for more than the simple identification tags used in supply chain applications. High memory RFID is meant to store, maintain and manage complete life cycle histories of assets with up to 24 Kbytes of information for extensive MRO activities or critical business intelligence required on the asset itself.
Tego has provided the high memory TegoChipTM to aviation companies including aircraft and equipment manufacturers and MRO organizations since 2008. No, there isn't any other high memory chips besides TegoChip that has passed the stringent AS5678 standards for flyable parts. Tego is an author of the ATA Spec2000 standards so all of Tego products' are guaranteed compliant.
