Programmable Read Only Memory (PROM)
As its name implies, this type of ROM can be programmed using special equipment. However, PROM's can be programmed only once. The advantage of this type of ROM is that it can be programmed with many different types of software and does not rely on hard wiring the logic for the program into the chip itself.
The process of programming a PROM is known as "burning." Programming a PROM is analogous to burning a CD-R (Chapter 0110). The media is written to once, and can be read many times. This technology is known as Write Once Read Many, or WORM technology. Again, the industry began demanding a better technology of ROM that could be erased and programmed again. Enter the Erasable Programmable Read Only Memory, or EPROM.
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