# Morris Mano Edition 3 Exercise 4 Question 14 (Page No. 150)

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Design a combinational Circuit that can convert a decimal digit from the  2 -4- 2- 1 code to the 8 -4- 2- 1.

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A BCD to seven segment decoder is a combinational circuit that converts a decimal digit in BCD to an appropriate code for the selection of the segments in the display indicator used for displaying the decimal digit in the familiar form. The seven output of the ... to Seven-segment decoder using the minimum number of the NAND gates. the Six invalid combinations should result in a blank display.
The adder-subtractor circuit of figure has the following values for mode input M and data inputs A and B. In each case, determine the values of the outputs: $S _ 4 S _3 S _2 S _1$ and $C _5$. M A B 0 0111 0110 0 1000 1001 1 0101 1000 1 0000 1010