Square wave oscillator on PSpice simulation
The LM193 has an open collector output therefore, it needs a pull up resistor: -

Examples of a relaxation oscillator using a generic op-amp with push-pull output on the left and a single-supply connected LM193 (that requires a pull-up) on the right: -

Without a pull up resistor, the 100 ohm positive feedback resistor and 1 kohm resistor power the open collector output but not from the positive supply but from 0 volts. Hence that is why you see such an asymmetrical output voltage. Use a 1 kohm pull up resistor to V+ and increase R1 from 100 ohms to something like 10 kohm. 100 ohm is much too low for decent operation.