In the formation of Routh-Hurwitz array for a polynomial, all the elements of a row have zero values. This premature termination of the array indicates the presence of

A cascade of three identical modulo -$$5$$ counters has an over all modulus of

Which of the following logic circuits is a realization of the function $$F$$ whose karnaugh map is shown in figure

An output device is interfaced with $$8$$ bit microprocessor $$8085$$$$A.$$ The interfacing circuit is shown in figure

The interfacing circuit makes use of $$3$$ line to $$8$$ line decoder having $$3$$ enable lines $${E_1}\,\,\overline E {}_2,$$ $$\,\overline E {}_3$$. The address of the device is