0
The advantages were "accumulative", so a history of the development of ROM is best to explain them:
First came ROM - Read-Only Memory. Unlike RAM, ROM could not be written to but had the advantage that it was non-volatile which means its contents are permanently there, they do not disappear when power is removed. But the contents were put there in the factory, you could not "program" the contents yourself.
Then came PROM - Programmable ROM. With PROM you could, if you owned a programming machine or "programmer", set the contents of the PROM yourself, one time, before your put it in the electronic circuit board.
Next came EPROM - Eraseable PROM - with EPROM if you needed too you could take the EPROM out of the circuit board, put it in an EPROM eraser to reset the contents, and then program it again in the programmer. The EPROM eraser was a small box that the EPROM was placed inside. When the box was turned on ultra-violet light shined into the EPROM thorough a small "window" on the top of each EPROM, erasing the contents.
Finally came EEPROM or E2PROM - Electronically Erasable PROM. With EEPROM you didn't need the eraser or the programmer! The EEPROM can be programmed, again and again while it is on the circuit board, by sending a sequence of signals to certain pins on the device.
Wiki User
∙ 15y ago
Add your answer:
Earn +20 pts
What type of memory that can be reprogrammed?
CMOS, EEPROM and EPROM
How is eprom erased?
EPROM is basicaaly of two types- EEPROM and UVEPROM. EEprom can be ereased by uising electrical pulses, whereas UVEPROM can be ereased by placing the IC in ultravoilet light for atleast 20 minutes.
What are the kind of ROM?
ROM can be broadly of three types, namely PROM (programmable read only memory), EPROM (erasable PROM), and EEPROM (electrically EPROM). Many versions of EEPROMs are available.
What is the explanation for the four types of ROM?
ROM- read only memory.. types are masked rom, prom, eprom and eeprom.
How do you do mileage correction on a 2000 Honda Accord?
very easy, there is an eprom you have to desoder in the rear of the speedometer. take that out and plug it into the an eprom reader and change it Or if you're not competent at eeprom removal and editing try a company such as: www.dw-mileagecorrection.co.uk
How do you program your replacement ecu for your 91 firebird?
if you installed a new ECU. you install your old mem cal eprom the best way is to desolder the factory eprom solder in a zif socket purchase atmel 29c256 eeprom. you would need software such as tuner cat to change parameters you would need a eeprom programer such as pocket programer and write in .bin
Does n64 GoldenEye cartridge use sram or a eprom?
It does NOT use a Volatile(or battery-packed) save. I don't know whether it uses EEPROM or Flash Ram, but both will last forever.
What are the 2 main types of ROM called?
PROM (programable read only memory) EPROM (eraseable programable read only memory) PROM (programable read only memory) EPROM (eraseable programable read only memory) PROM (programable read only memory) EPROM (eraseable programable read only memory) PROM (programable read only memory) EPROM (eraseable programable read only memory) PROM (programable read only memory) EPROM (eraseable programable read only memory) PROM (programable read only memory) EPROM (eraseable programable read only memory)
What is the function of EPROM?
EEPROMs are used to store user programmable information. • When a device is switch on it will copies all data or information from the EEPROM to the microcontroller (MCU). For example, the EEPROM will let the microcontroller know the frequencies at which the monitor is going to operate. • The EEPROM is used to store the current settings of the device. The settings of the device will not be erased even when the device is turned off. Anytime a change is made in the device settings, the microcontroller updates the setting in the EEPROM. When the device is turn on again, the stored settings are used to set up the device for operation. for more .. edatasl.blogspot.com/2012/03/eeprom-ics.html
Eeprom stands for?
EEPROM stands for
What is the difference between a eeprom and flash?
EEPROM is an older, more reliable technology. It is somewhat slower than Flash.Flash and EEPROM are very similar, but there is a subtle difference. Flash and EEPROM both use quantum cells to trap electons. Each cell represents one bit of data. The presence - or absence - of electons in a cell indicates whether the bit is a 1 or 0.The cells have a finite life - every time a cell is erased, it wears out a little bit. In EEPROM, cells are erased one-by-one. The only cells erased are those which are 1 but need to be zero. (Writing a 1 to a cell that's 0 causes very little wear, IIRC)In Flash, a large block is erased all at once. In some devices, this "block" is the entire device. So in Flash, cells are erased whether they need it or not. This cuts down on the lifespan of the device, but is much, much faster than the EEPROM method of going cell-by-cell.Erasure method: Both Flash and EEPROM erase cells by means of an electric field. I think it is high-frequency and "pops" the electrons out of the cells, but I am not certain.Other similar devices are EPROM (sometimes UVEPROM) and OTPROM (sometimes PROM). EPROM/UVEPROM lacks the structures that generate the electrical field for erasure. These devices have a window on top, usually covered by a paper sticker. To erase, the sticker is removed and the device is exposed to intense ultraviolet light for 30-45 minutes.The only difference between OTPROM and UVEPROM is that OTPROM lacks the UV window - there is no way to erase the data. Adding the UV window to the device package significantly increases cost, so there is a niche for one-time-programmable devices.
The definition for ROM ram eprom eeprom?
ROM: Read Only Memory, Memory that can only be read, it cannot be rewritten. RAM: Random Access Memory, it's a kind of memory that can be read and rewritten many times, it loses its information when it loses power.
