Digital Electronics
A PROM

 is erasable by ultraviolet light
 can be programmed any number of times
 is mask programmed
 can be programmed only once

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Digital Electronics
In case of OR gate, no matter what the number of inputs, a

0 at any input causes the output to be at logic 1.
1 at any input causes the output to be at logic 0
1 at any input causes the output to be at logic 1
0 any input causes the output to be at logic 0

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