How to analyze this opamp circuit with logic gates, Zener diodes and transistors?

Published: 14/06/2019
How to analyze this opamp circuit with logic gates, Zener diodes and transistors?
Source: ELECTRONICS.STACKEXCHANGE.COM

This is the circuit with this values: $$\text{Logic gate of CMOS,VTH=2.5v,VCC=5v,Vz=3.3v,Vd=0.7,VBE=0.7}$$ : The left side is working like a SR FF , and the right side Schmitt trigger comparator and I did calculate the VT1 and VT2 correct . What is unclear for me is: how does the PNP and NPN transistor work? where is the base resistor? what is the state of transistor Q1 and Q2(saturation, active,

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