What is RAM , ROM and VRAM | In practical way what is work of RAM and ROM in mobile | Read Only Memory | Random Access Memory | Video Random Access Memory

RAM (RANDOM ACCESS MEMORY):

What is RAM:-

        RAM (Random Access Memory) is  hardware in a computing device where the operating system (os), application programs and data in current use are kept so they can be quickly reached by the device's processor.

        It is like a dancing stage where are application are perform their performance. It is also related to processor of device. 

       Because of its volatility, RAM can't store permanent data. RAM can be compared to a person's short-term memory, and a hard disk drive to a person's long-term memory. Short-term memory is focused on immediate work, but it can only keep a limited number of facts in view at any one time. When a person's short-term memory fills up, it can be refreshed with facts stored in the brain's long-term memory.

RAM kya Hai:-

      RAM ek aisa memory h jo lambe samaye tak koi apps ko store  nhi rkhta h kuch samay k baad wo apps ko vanished kr deta h .

     App aise samjh skte h ki RAM ek dancing stage h jaha pr sare application apana performance karte h aur wapas hat jaate.

    Isliye RAM jitani badi hogi utani hi smoothly apka phone aur application chalega. 

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RAM works

The term random access as applied to RAM comes from the fact that any storage location, also known as any memory address, can be accessed directly. Originally, the term Random Access Memory was used to distinguish regular core memory from offline memory.

Offline memory typically referred to magnetic tape from which a specific piece of data could only be accessed by locating the address sequentially, starting at the beginning of the tape. RAM is organized and controlled in a way that enables data to be stored and retrieved directly to and from specific locations.

Other types of storage -- such as the hard drive and CD-RAM-- are also accessed directly or randomly, but the term random access isn't used to describe these other types of storage.

RAM is similar in concept to a set of boxes in which each box can hold a 0 or a 1. Each box has a unique address that is found by counting across the columns and down the rows. A set of RAM boxes is called an array and each box is known as a cell.

To find a specific cell, the RAM controller sends the column and row address down a thin electrical line etched into the chip. Each row and column in a RAM array has its own address line. Any data that's read flows back on a separate data line.

RAM is physically small and stored in microchips. It's also small in terms of the amount of data it can hold. A typical laptop computer may come with 8 gigabytes of RAM, while a hard disk can hold 10 terabytes. 

ROM (Read Only Memory):

What is ROM :-

Read-only memory (ROM) is a type of non volatile memory used in computers and other electronic-device. Data stored in ROM cannot be electronically modified after the manufacture of the memory device. Read-only memory is useful for storing software that is rarely changed during the life of the system, also known as firmware. Software applications (like video games) for programmable devices can be distributed as plug-in cartridge containing ROM.

Strictly speaking, read-only memory refers to memory that is hard-wired, such as diode matrix or a mask ROM  Integrated Circuit (IC), which cannot be electronically changed after manufacture. Although discrete circuits can be altered in principle, through the addition of bodge wires and/or the removal or replacement of components, ICs cannot. Correction of errors, or updates to the software, require new devices to be manufactured and to replace the installed device.

Types of PROM include:

• Ultraviolet-erasable ROM (UV-ROM) - ROM whose contents can be erased using ultraviolet light, and then reprogrammed.

• Erasable programmable ROM (EPROM) - A type of ROM that is programmed using high voltages and exposure to ultraviolet light for about 20 minutes.

• Electrically-erasable programmable ROM (EEPROM) - Often used in older computer chips and to control BIOS, EEPROM can be erased and reprogrammed several times while enabling the erase and writing of only one location at a time. Flash memory is an updated version of EEPROM that allows numerous memory locations to be changed at the same time.

ROM kya Hai:

         ROM, Read Only Memory non volatile memory hoti hai jo applications , videos, music, mp3, mp4 and documments saare ko permanent store karta hai jo mobile ko ya computer ko switch off or shut down karne k baad bhi sare files as it is store rhte h. 

ROM work:-

ROM is sustained by  a small, long-life battery in the computer. It contains two basic components: the decoder and the OR logic gates In ROM, the decoder receives input in binary form; the output will be the decimal. The OR gates in ROM use the decoder's decimal output as their input.

ROM performs like a disk array. It contains a grid of rows and columns that are used to turn the system on and off. Every element of the array correlates with a specific memory element on the ROM chip. A diode is used to connect the corresponding elements.

When a request is received, the address input is used to find the specific memory location. The value that is read from the ROM chip should match the contents of the chosen array element.

VRAM(Video Random Access Memory):

What is VRAM:

Video random access memory (VRAM) is dedicated computer memory used to store the pixels and other graphics data as a framebuffer to be rendered on a computer monitor. This is often different technology than other computer memory, to facilitate being read rapidly to draw the image. In some systems this memory cannot be read/written using the same methods as normal memory; it is not memory mapped.