BCD input 1000 is fed to a 7 segment display through a BCD to 7 segment decoder/driver. The segments which will lit up are

.

Decoder converts binary/BCD to alphanumeric.

Since it is non-saturating, ECL has low propagation delay.

In OR any input high means high output.

7BF₁₆ = 7 x 16² + 11 x 16¹ + 15 x 16⁰ = 1983 in decimal = 0111 1011 1111 in binary.

Since V(1) is lower state than V(0) it is a negative logic circuit. Since diodes are in parallel, it is an OR gate.

Minimum number of outputs when input is decimal 1 and maximum number of outputs when input is decimal 8.

If A = 0, Y = 1 and A = 1, Y = 0 Therefore Y = A.

AB + AB = A(B + B) = A . 1 = A.