Digital Electronics
The output of a logic gate is 0 when all its inputs are at logic 1. The gate is either

 a NAND or an AND
 a NAND or an X-OR
 a NOR or an X-NOR
 a NAND or an X-NOR

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Digital Electronics
A PROM

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

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