What is an EPROM
Below is a MRR and PLR article in category Computers Technology -> subcategory Other.
Understanding EPROM: A Guide
Introduction to EPROM
EPROM, or Erasable Programmable Read-Only Memory, is a type of memory chip that retains data even without power. Invented by Israeli engineer Dov Frohman in 1971, EPROM can store data for up to two decades and is capable of being read an unlimited number of times.
How EPROM Works
Before usage, EPROM chips are programmed using an external device. They require a specific ceramic package featuring a quartz window, usually covered with opaque tape. For reprogramming, the chip is removed, the tape is peeled away, and the chip is exposed to UV light at a wavelength of 235nm for about 20 minutes.
Applications and History
Before EEPROMs and flash memory, EPROM was essential for storing programs in microcontrollers, such as certain versions of the Intel 8048 and the “C” edition of the PIC microcontroller. These microcontrollers used expensive windowed versions of EPROM for debugging and development. Direct exposure of the chip’s die to sunlight can cause unpredictable behavior.
EPROM Variations and Compatibility
EPROMs come in various sizes concerning both packaging and storage capacity. While different manufacturers’ EPROMs are compatible for reading, programming may involve slight differences. EPROMs can typically be recognized by forcing 12V on pin A9 and reading two data bytes, though programmer software often allows for manual configuration to ensure accurate programming.
Legacy and Evolution
EPROMs paved the way for modern EEPROMs and flash memory, playing a crucial role in the development of these technologies.
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