What are similarities and differences of RAM and Eprom?

Answer 1

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Answer 2

The information stored in an EPROM chip can be erased by exposing the chip to strong UV light. EPROM chips are easily recognised by the small quartz window used for erasure. Once erased the chip can be re-programmed. EPROM is more expensive to buy per unit cost, but can prove cheaper in the long run for some applications. For example if PROM was used for firmware that needed upgraded every 6 months or so - it could prove quite expensive buying new chips!

This has the added advantage that the information stored can be re-written in blocks and hence can be used to store system settings that the user may want to change periodically. This solid state memory has considerably reduced in price over recent years and is nowadays commonly used to store system settings such as BIOS settings.

Answer 3

ROM stands for read only memory

EPROM stands for erasable programmable read - only memory

DIFFERENCE

Difference between these two lies in the possibility of modification of their contents.

ROM once created by manufacturer can not be modified in any way whereas EPROM chips are custom made to accommodate individual user needs they can be erased and rewritten again.

PROCESS OF REPROGRAMMING EPROM CHIPS

Reprogramming of EPROM chips is carried out by a special device which uses ultraviolet light to erase data however EPROM can not be modified in part it's entire content gets destroyed when exposed to ultraviolet light.

Additionally In order to reprogram EPROM chip it has to be taken out of the machine and put it back when changes have been made.

Improvement over EPROM is EEPROM ( electrically erasable programmable read only memory)

Regards,

Prime

Answer 4

PROM can't be rewritable and EPROM is erasable or reprogram able. The PROM has a fuse to protect loaded data where as there is no fuse in EPROM. The PROM is use in military purpose where as EPROM is used in programmable gadgets like toys and mobiles

Answer 5

Random Access Memory is emptied every time you turn the computer off. Electronically Erasable, Programmable Read Only Memory is used to keep safe the settings for the computer very fast the next time it is turned on.

Answer 6

ROM, PROM or EPROM are used to store information which must be retained when the power is off, typically they would be used to store the BIOS code.

ROM and PROM are memory types which cannot be erased by electrical signals (provided they are not sufficient to damage it!). The difference between them is:

ROM (Read-Only Memory) is normally 'mask programmed' during manufacture. The data is part of the photographic image used to make the IC.

PROM (Programmable Read-Only Memory) is an empty memory which can be electrically programmed once only, it has no erase function. They allow latest software version to be programmed permanently.

EPROM (Erasable Programmable Read-Only Memory) can be erased and reprogrammed - for example when upgrading a BIOS.

EEPROM (Electrically Erasable Programmable Read-Only Memory) is quite different, it is a memory which is designed to be reprogrammed more frequenty, for example the BIOS configuration settings. It can be treated almost like RAM except it retains its contents when power is removed.

Answer 7

RAM (Random Access Memory) is dynamic, meaning that when power is lost, all the stored data is also lost. EPROM (Electrically Programmable Read Only Memory - also capable or Random Access) uses transistors that once set by a higher than normal voltage (programming voltage), retain their charge for 10 to 20 Years. EPROM does not lose its data when powered down.

Answer 8

ROM is Read Only Memory. ROM memory cannot be modified as it is hard coded to the chip. The main reason it is hard coded is that you want a fixed task for your hardware. Since ROM technology is used mostly in devices (Hardware) that does a specific task.

Now, If you want to rewrite that program in ROM , it is possible in EPROM (erasable programmable Read Only Memory). So this Read only memory is programmable means you can alter the instructions.

Both a same because of the fact that EPROM need high UV (read ultra Violet rays ) or electricity (high volts) to erase existing memory and reprogram it.

In case of ROM, it is not possible to do reprogramming.

Answer 9

well they both refer to computer memory. but ram stands for random access memory which is magnetic and temporary. and ROM which is burned in and is permanent