RAM and ROM Memory
What is RAM memory on a computer:
What is RAM memory:
(RAM)Random-access memory means that the CPU can directly access any address location of RAM memory. That is why it is named as
random access memory and it is very quickly accessible Ram is a volatile memory. It stores the data until the power is switched on once the power goes off. The whole data in RAM gets erased and it only stores data that has to be currently processed the storage capacity of RAM is high ranging from 64 MB to 16gb ram is the fastest and costliest memory of the computer. Because of its speed, it is very expensive it is a read-write memory of the computer. This means the processor can read the instructions from the RAM and write, the result to the RAM that's how data can be modified in RAM. There are two types of RAM first is static Ram second is dynamic Ram static Ram is one, which requires the constant flow of the power to retain the data inside. Here the interrupted power could result in loss of data. The static Ram is made up of transistors and latches static Ram is faster and more expensive than dynamic. Ram it is mainly used as cache memory for the computer. While dynamic Ram needs to be refreshed to retain the data it holds because the capacitor is used in the
construction of dynamic Ram and capacitor has a charge leakage property, that's why dynamic Ram requires a separate refresh circuit it is slower and cheaper than static Ram and it is highly dense.
What is ROM memory on a computer:
(ROM)Read-only memory; Unlike RAM the ROM memory, can't be directly accessed by CPU the data first transferred to the realm, and then CPU can access that data from the RAM. ROM is a non-volatile memory the data inside the ROM retains even if the power of the CPU is switched off. The capacity of ROM is comparatively smaller than RAM. It is slower and cheaper than RAM. The data in ROM can only be read by a CPU,
that's why it is said read-only the data in ROM cannot be modified ROM's. Towards the instruction that a computer requires during bootstrapping. I think you guys must be aware of the bootstrapping process. It is a self-starting process, where the basic software is loaded into the computer memory after power on or on a reset.
Basically, there are three types of ROM. First P ROM, EP ROM, and IEP ROM. The first pyram programmable ROM can be modified only once by the user the parent chip has small fuses. Which are burned open during programming that's why it is not erasable second EP ROM erasable and programmable ROM. The content of this ROM can be erased using ultraviolet rays and the ROM can be reprogrammed during programming an electrical charge is trapped in an insulated gate region. The charge can be retained for more than 10 years because the charge has no leakage path. For erasing discharge ultraviolet light is passed through a quartz crystal window, for about 40 minutes. This exposure to ultraviolet light dissipates the charge, at last, we have EEPROM electrically erasable and programmable ROM. It can be erased electrically and pre-programmed, about 10000 times both erasing and programming in EEPROM takes about 4 to 10 milliseconds. It is flexible because any location in IEP ROM can be selectively erased and programmed but only one byte is erased at a time, rather than the entire chip that's why it is kind of slow.
So guys here we have a comparison chart, which shows a substantial difference between RAM and ROM memory. RAM stands for Random Access Memory. Whereas ROM stands for read-only memory. RAM is readable and writable on the other hand ROM is only readable. RAM is used to store the data that has to be currently processed by the CPU. Temporarily in contrast to ROM stalls, the instruction required during bootstrap of the computer RAM is a volatile memory as against ROM is a non-volatile memory.
Data in Durham can be modified conversely data in ROM can not be
modified REM sizes from 64 MB to 16 GB on the contrary ROM is comparatively smaller than RAM. There are two types of RAM static Ram and dynamic Ram whereas ROM has three types.
Ram is a very expensive memory comparatively ROM.
