Digital Electronics
The difference between the diagram of a NOR and OR gate is

 OR has got a bubble at its output terminal
 NOR has got a bubble at its output terminal
 OR is more squared than NOR
 OR is more oval than NOR

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Digital Electronics
A PROM

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

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