ROM is in the form of a chip, so what does RAM look like

ROM is a read-only memory, which can ensure that data will not be lost after power failure, and generally ensure that more important data is guaranteed.

RAM is random access memory, and data is lost when power is off.

ROM and RAM both refer to semiconductor memory. The original meaning is: ROM means Read Only Memory, which means that this kind of memory can only be read, not written.

Whereas, RAM is an abbreviation for Random Access Memory. The origin of the term is due to the fact that early computers used magnetic drums as memory, and magnetic drums and magnetic tapes were typical sequential read-write devices. RAM can be read and written randomly.

Now ROM usually refers to non-volatile memory, or rather, no power down. They can still hold data when the system is powered off. So the disc also has the term cd-rom or ***-rom.

RAM usually runs out of power and has no data, typically like a computer's memory, which needs to be reloaded from the hard disk when the system restarts. Sometimes, if the data can be erased, the concept of RAM will also be borrowed, such as ***-RAM, which is actually just a *** disc that can be erased, not a real semiconductor memory.

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About the difference between smartphone ROM and RAM.

There are two types of memory: random access memory (RAM) and read-only memory (ROM). Among them, ROM is usually used to solidify and store some programs or data written by manufacturers, which is used to start the computer and control the working mode of the computer. RAM, on the other hand, is used to access a variety of dynamic input and output data, intermediate calculation results, and data exchanged with external memory and temporary data.

When the device is powered off, the data stored in the RAM is lost.

For mobile phones.

The speed of running games and programs depends on RAM, that is, dynamic memory, not static space, which is used to store things, which is equivalent to the Z drive of the mobile phone. RAM and ROMs are like your computer's memory and hard drive. To be precise, a C drive should not be called a ROM read-only memory.

The C drive should be called Flash, because the C drive is rewritable, and the size of the flash does not affect the running speed.

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If the power supply is suddenly interrupted while the PC is working, all the information in the ROM will not be lost.

RAM is the internal memory that directly exchanges data with the CPU, also known as main memory (memory). It can be read and written at any time, and it is fast, often as a temporary data storage medium for operating systems or other running programs. Storage that the contents of a storage cell can be removed or deposited as needed, and the speed of access is independent of the location of the storage cell.

This type of memory loses its contents when the power is off, so it is mainly used to store programs that are used for a short period of time. According to the working principle of the storage unit, random access memory is divided into static random access memory (English: static RAM, sram) and dynamic random access memory (English dynamic ram, dram).

RAM and ROM are opposite, RAM is the one in which the information disappears after the power is off, and the ROM will not disappear after the power off.

There are two types of RAM, one is static RAM and SRAM; One is dynamic RAM, DRAM. The former is much faster to store than the latter, and the memory we use now is generally dynamic RAM.

Some rookies have said that in order to increase the speed of the system, it is not enough to expand the cache, the larger the expansion, the more data cached, and the faster the system.

The cache is usually static RAM, and the speed is very fast, but the static RAM integration is low (storing the same data, the volume of static RAM is 6 times that of dynamic RAM), **high (static RAM of the same capacity is four times that of dynamic RAM), it can be seen that expanding static RAM as a cache is a very stupid behavior, but in order to improve the performance and speed of the system, we must expand the cache, so that there is a compromise method, not to expand the original static RAM cache, Instead, add some high-speed dynamic RAM as a cache, these high-speed dynamic RAM is faster than regular dynamic RAM, but slower than the original static RAM cache, we call the original static RAM cache Level 1 cache, and the later added dynamic RAM is called the Level 2 cache.

The contents of both L1 and L2 caches are replicas (maps) of frequently accessed data in memory, and they both exist to reduce access to slow memory by high-speed CPUs.

Usually, the CPU searches for data or instructions in the order of finding data or instructions: first find it in the first-level cache, find it in the second-level cache, and then find it in the second-level cache, if it can't find it, you can only find it in memory.

The differences between ROM and RAM are as follows:

1. Conceptual differences:

RAM stands for random storage memory, which loses its stored content when the power is off, so it is mainly used to store programs that are used for a short period of time.

ROM stands for read-only memory, which is a type of solid-state semiconductor memory that can only read out data stored in advance.

Second, the correspondence is different:

The RAM in the mobile phone corresponds to the memory of the computer, which is responsible for the operation of programs and the exchange of data.

3. Different ways of writing:

In the middle of the ram is A.

In the middle of the rom is the introduction:

Memory is a device or component used to store a large amount of information in a digital system, and is an important part of computers and digital devices. Memory can be divided into two categories: random access memory (RAM) and read-only memory (ROM).

Random Access Memory (RAM) can both store and read information to and from a specified cell. Any information stored in RAM is lost when power is off, so RAM is volatile memory.

ROM is read-only memory, in addition to fixed storage data, **, solidification program, also has a wide range of uses in combined logic circuits.

The difference between RAM and ROM is:

ROM and RAM are both a kind of storage technology, but the principle of the two is different, RAM is random storage, and the data will not be saved when the power is off, while the ROM can still save the original data in the case of power failure. ROM stands for Read Only Memory, which means that this kind of memory can only be read and not written. Whereas, RAM is an abbreviation for Random Access Memory.

RAM can be read and written randomly.

In the computer, we all know that there is memory and hard disk, in fact, memory is a kind of RAM technology, and ROM is similar to Qingdou hard disk technology, both are memory, but the speed of RAM is much higher than the speed of ROM.

In the mobile phone, RAM refers to the memory of the mobile phone, which belongs to the memory of Zheng Zheng's brother in the mobile phone, belongs to random storage, and the speed is higher than that of ROM, which plays an important role in the configuration performance of the mobile phone.

ROM belongs to external storage, for example, we can often buy SD card and put it in the mobile phone, it is the mobile phone ROM, and the mobile phone ROM is called the memory card we usually say, which can also be simply understood as the mobile phone hard disk. It is used to store mobile phone system files, **, movies, etc., and will not lose data with power failure, and the larger the ROM, the more data will be stored. <>

Generally speaking, ROM is used to hold the system (equivalent to a hard disk) and RAM is used to run programs (equivalent to memory).

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RAM (Random Access Memory) stands for Random Access Memory, which is the equivalent of removable storage on a PC to store and save data. It can be read and written at any time, and RAM is usually used as a temporary storage medium (known as system memory) for the operating system or other running programs. However, RAM cannot retain data when the power is off, and if data needs to be saved, it must be written to a long-term memory (e.g. a hard drive).

Because of this, RAM is sometimes referred to as "variable memory". RAM memory can be further divided into two categories: static RAM (SRAM) and dynamic memory (DRAM). DRAM is widely used as the primary memory of the system due to its low unit capacity**.

The biggest difference between RAM and ROM is that the data saved on RAM will automatically disappear after a power failure, while ROM will not. 4 8M RAM is enough for the operation of general applications, and if you pursue multi-** functions, 64M RAM capacity can only be regarded as a basic requirement. ROM (Read Only Memory) stands for Read-Only Memory, which is equivalent to a hard disk on a PC to store and save data.

ROM data cannot be updated at will, but it can be read at any time. Even when the power is down, the ROM is able to retain data. However, once the data is written, it can only be changed in a special way or at all, so ROMs are often used in embedded systems to store operating systems.

The mainstream PDAs on the market now have ROM sizes of 64MB and 128MB. The biggest difference between RAM and ROM is that the data saved on RAM will automatically disappear after a power failure, while ROM will not.