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Which of the following statements correctly describes the differences between two types of ROM?

Several types of read-only memory devices can be modified after they are manu`factured. Which of the following statements correctly describes the differences between two types of ROM?

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A.
PROM can only be programmed once, while EEPROM can be programmed multiple times.

B.
A UV light is used to erase data on EEPROM, while onboard programming circuitry and signals erase data on EPROM.

C.
The process used to delete data on PROM erases one byte at a time, while to erase data on an EPROM chip, you must remove it from the hardware.

D.
The voltage used to write bits into the memory cells of EPROM burns out the fuses that connect individual memory cells, while UV light is used to write to the memory cells of PROM.

Explanation:
A: Programmable read-only memory (PROM) is a form of ROM that can be modified after it has been manufactured. PROM can be programmed only one time
because the voltage that is used to write bits into the memory cells actually burns out the fuses that connect the individual memory cells. The instructions are “burned
into” PROM using a specialized PROM programmer device. Electrically erasable programmable read-only memory (EEPROM) can be rewritten. Its data storage can be
erased and modified electrically by onboard programming circuitry and signals.
B is incorrect because a UV light is used to erase data on erasable and programmable read-only memory (EPROM). To erase an EPROM chip, you must remove the
chip from the computer. The EPROM chip has a quartz window, which is where you point the UV light, which erases all of the data on the chipnot just portions of it.
Electrically erasable programmable read-only memory (EEPROM) can be erased and modified electrically by onboard programming circuitry and signals.
C is incorrect because the process used to delete data from EEPROMnot PROMinvolves erasing one byte at a time. This is a slow process, so a new form of
memory was developed: flash memory. The second half of this answer is correct: To erase data on EPROM, you must remove it from the computer and wave a UV
wand, which erases all of the data on the chip.
D is incorrect because the voltage that is used to write bits into the memory cells of PROMnot EPROMburns out the fuses that connect the individual memory
cells. The instructions are “burned into” PROM using a specialized PROM programmer device. Also UV light is used to erase data from EPROMnot write data to
PROM. EPROM holds data that can be electrically erased or written to. To erase the data on the memory chip, you need your handy-dandy ultraviolet (UV) light device
that provides just the right level of energy. The EPROM chip has a quartz window, which is where you point the UV light. Although playing with UV light devices can be
fun for the whole family, we have moved on to another type of ROM technology that does not require this type of activity.

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