What are the logic 1 and logic 0 values at the output

Question

Consider the circuit in Figure. Neglect base currents.

(a) What are the logic 1 and logic 0 values at the output terminals v_O1 and v_O2?.

(b) For v_X = v_Y = logic 0, determine R_E such that i_E = 0.25 mA.

(c) Using the results of part (b), determine R₁ such that i_D1 = 2_iR1 when Q_R is conducting.

(d) For v_X = v_Y = logic 1 and R₁ = R₂, determine i_E, i_R2, and i_D2.

(e) For v_X = logic 0 and v_Y = logic 1, calculate the power dissipation in the circuit.