Non-random access is sequential access, which can not be accessed by subscripts, but only by storage order, which is related to storage location, such as linked list.
Question 2: What does random access memory mean?
Question 3: Why are the elements in the array randomly stored? What does random storage mean for arrays? For example, the array a[ 10] has one [0]...[9] * * * 10 elements.
You can read and write a [0], a [1] and a [5] anywhere in the array, which is called random storage.
Random storage and sequential storage orientation pairs
Structures such as queues, stacks and texts can only be stored sequentially, and cannot be read or written directly anywhere.
Question 4: Composition principle of computer for postgraduate entrance examination: What is the difference between random storage mode, random access and random access? Random access: Random means that the access time has nothing to do with the physical location of the storage unit, and access means reading and writing operations. The main memory in the computer, such as RAM, adopts this method, so it is called random access memory.
Random access focuses on access and is generally understood as read operation. Because ROM is a read-only memory, it can be accessed randomly like RAM, but it cannot be accessed randomly.
Random storage can be understood as equivalent to random access, only RAM can;
Both RAM and ROM belong to memory, also called main memory; CD-ROM is the first generation of optical disk storage, which can only be read, not written. It is an external memory and an auxiliary memory. It records information by laser etching. From the access mode, it has the same properties as disks (floppy disks and hard disks) and belongs to direct access mode.
What does question RAM mean? Data loss after power failure of RAM memory
ROM drive can still save data and read only after power failure, that is, it can only read but not write.
Question 6: Random Access Random Access Memory uses SRAM: Static Random Access Memory uses multi-transistor design. Usually, each memory cell uses 4-6 transistors, but there is no capacitor. SRAM is mainly used for caching. DRAM: Each memory cell in a dynamic random access memory consists of paired transistors and capacitors, which need to be refreshed constantly. FPM DRAM: fast page mode dynamic random access memory is the earliest DRAM. In the whole process of memory bit positioning according to row and column addresses, FPM DRAM must be in a waiting state, and the next bit of data can only be processed after the data is read. The maximum transfer rate to L2 cache is about 176MB per second. EDO DRAM: Extended Data Output Dynamic Random Access Memory can start processing the next bit of data without waiting for the whole process in the process of processing the previous bit of data. As long as the address of the previous bit of data is successfully located, EDO DRAM starts to address the next bit of data. It is about 5% faster than FPM. The maximum transfer rate to the secondary cache is about 264MB per second. SDRAM: Synchronous dynamic random access memory adopts the concept of burst mode, which greatly improves the performance. In this mode, when reading data, one memory line is locked first, and then each memory line is scanned quickly, and the bit data on that line is read at the same time. The reason for this design idea is that most of the time, the data requested by CPU are adjacent in memory. SDRAM is about 5% faster than EDO RAM, and has become the most widely used one in desktop memory. The maximum transfer rate to the secondary cache is about 528MB per second. DDR SDRAM: Double-rate synchronous dynamic RAM is similar to SDRAM, but it has higher bandwidth, that is, it is faster. The maximum transfer rate to the secondary cache is about 1064MB per second. ( 133 MHz DDR SDRAM)。 RDRAM:Rambus dynamic random access memory is essentially different from the previous DRAM system. The RDRAM designed by Rambus Company adopts Rambus in-line memory module (RIMM), and its external dimensions and pin structure are similar to those of standard DIMM. RDRAM is different in that it adopts a special high-speed data bus design called Rambus channel. The working frequency of RDRAM memory chip in parallel mode can reach 800 MHz (data rate 1600 MHz). Because of its high running speed, RDRAM generates much more heat than other types of chips. In order to dissipate excess heat, Rambus chip is equipped with a radiator, which looks like a slender wafer. Just as DIMM has its small form factor version, manufacturers have designed small form factor RIMM for notebook computers. Credit card memory: Credit card memory is a patented independent DRAM memory module, which should be inserted into a dedicated long slot of a notebook computer when used. PCMCIA memory card: another independent DRAM memory module of notebook computer. This kind of memory card does not enjoy the patent right. As long as the system bus can match the memory card settings, it can be used on various notebook computers. The term $ term CMOS RAM refers to a small-capacity memory used in computers and other devices to store information such as hard disk settings ―― please refer to the article "Computer Basics" for more information. This kind of memory needs a small battery to maintain its contents. VRAM: Video RAM, also known as Multiport Dynamic Random Access Memory (MPDRAM), is specially used for display adapters and 3D accelerator cards. The so-called "multi-port" means that VRAM usually has two independent access ports instead of a single port, allowing CPU and graphics processor to access RAM at the same time. VRAM is located on the graphics card, and there are many kinds, many of which enjoy patent rights. The size of VRAM usually determines the resolution and color depth of the display. VRAM can also be used to store some graphics-specific information, such as 3D geometric data and quality maps. Real multi-port VRAM is often expensive, so now graphics cards all use S-SGRAM (Synchronous Graphics RAM) as a substitute. The performance of the two kinds of video memory is similar, and the price of SGRAM is cheaper.
Question 7: What does random storage mean in logistics? There is generally no fixed warehouse penalty at 10. New small products that are rarely used will be randomly assigned a warehouse number according to the computer after storage! And the resulting storage!
Question 8: What does randomness of random memory mean? Random access memory is random compared with sequential memory, which can only access data in a certain order, and the access time is related to the physical location of the storage unit. The contents of any storage unit of random access memory can be compensated by random access data, and the access time is independent of the physical location of the storage unit. Relatively speaking, random access memory is more flexible and more random than sequential memory, so it is called random access memory.
Question 9: What does array random access mean in C language? Random access needs to be compared with sequential access, and it will be clear after the comparison.
For example, give you a list of people and let you find the person in position 5. The first method is that you start from the first position and look back one by one until you find the position in position 5. This is sequential access.
And if you already know the location of 5, you don't need to go directly to the location of 5 through the first four locations, then this is random access.