Read only memory : PROM and EPROM (module 33)
In this section we will discuss on the next types of primary memory like ROM ( read only memory) other than RAM (Random access memory) and it's individual types like PROM, EPROM, EEPROM etc. And will also discuss about Flash memory in the end.
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Looking backward : 
This is the 33rd module on learning C with us. Earlier we discussed on the basic introduction and structure of C, preprocessor it's features, intermediate and executable codes. compilation and execution process of a C program. And keywords and identifiers, data types, variables and constants, scope of variables, operators and expressions in C. Type casting in #C. Introduction to input and output functions and reading a character in #C. Unformatted and formatted input functions. Branching statements like if, if-else, nested if-else. Different types of loops and units, different memory types.
In this section we will discuss on the next types of primary memory like ROM ( read only memory) other than RAM (Random access memory) and it's individual types like PROM, EPROM, EEPROM etc. And will also discuss about Flash memory in the end.
Read only memory (ROM) :-
ROM is a class of storage media used in computer and other electronic devices. It is a read only memory. We cannot write data in this memory. It is non-volatile memory. i.e. it can hold data even if power is turned off.
ROM can further divided into following categories :-
Programmable read only memory (PROM) :-
It is a memory chip on which the operation of data can be performed only once. The data is stored on this chip permanently. i.e, once a program is written on the PROM. It cannot be erased or destroyed.
Erasable programmable Read only memory (EPROM) :-
EPROM is a type of computer memory chip that retains its data when its power supply is switched off. It is a non volatile in nature. Once programmed, an EPROM can be erased only by exposing it to strong Ultraviolet light. It is cheaper than PROM because it is reusable.
In the next module we will continue our discussion on other types of primary memory and secondary memory and other extended divisions of ROM like EEPROM and flash memory and their uses.
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