What is ROM and types of ROM
Whatis ROM and types of ROM?
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As the name implies, a read-most effective memory(ROM) is a reminiscence unit that that performs the read operation most effective; it does nothave a write capability. This implies that the binary statistics saved in a ROMis made permanent in the course of the hardware production of the unit and cannot bealtered with the aid of writing specific phrases into it (non-volatile). Whereas a RAM is ageneral- purpose tool whose contents may be altered during the computationalprocess, a ROM is limited to studying phrases that are permanently stored withinthe unit. The binary statistics to be saved, exact by the designed, isthe embedded inside the unit to shape the desired interconnected sample.
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ROMs comewith unique internal digital fuses that can be “programmed” for a specificconfiguration. Once the pattern is mounted, it remains within the unit evenwhen strength is grew to become off and on once more. ROMs are used for packages in whichit is understood that the information never needs to be altered, as an instance monitorprogram controlling a machine. These, but are slower than RAM.
There are numerous varieties of ROM which aregiven underneath: -
1)Programmable Read Only Memory(PROM) is a ROM that can be programmed to recordinformation the usage of a facility called PROM-programmer. Once the chip has beenprogrammed, the recorded records cannot be modified i.E., PROM end up sameas ROM.
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2)Erasable Programmable Read OnlyMemory (EPROM) is every other type of ROM thatcan be erased and the chip may be reprogrammed to record distinct facts usinga special PROM- application facility. Erasure is accomplished with the aid of exposing the chip toultraviolet mild. When an EPROM is in use, information can handiest be “examine” andthe information remains at the chip unit it's miles erased. EPROM are of two types-UPROM (ultraviolet PROM) and EAPROM (electrically alterable PROM).
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3)Electrically Erased PROM(EEPROM). This type of ROM can be programmed anderased by electric signals. It does no longer require publicity to ultraviolet lightto erase its contents as EPROM memory does, and provides an smooth method to loadand shop temporary or permanent statistics in a shape of ROM memory. Informationloaded in this memory may be retained for many years without any strength provided;one in all its new programs is as a returned-up to RAM memory whose contents arelost in a electricity failure. When energy is back, the EEPROM can be used toreplace the lost contents of the RAM memory and the microcomputer can continueworking just as though not anything had passed off. Even newer gadgets are combining RAMand EEPROM memory in a unmarried integrated circuit.
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