Digital Electronics
The maximum positive and negative numbers which can be represented in two’s complement form using n bits are respectively,

 +(2n-1-1),-(2n-1-1)
 +(2n-1-1),-2n-1
 +2n-1,-(2n-1+1)
 +2n-1,-2n-1

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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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