Did the id Software guys make the ingame demos with mouse movement (vertical) ON? Which cannot be disabled through normal options.

Or did they use at the time some utility to disable mouse movement so it would only act as rotate?
I am watching those demos but I still could not figure it out if mouse movement was ON or OFF.

(for ppl wanting to play old Doom games in Dosbox there is the utility called novert which is (apparently)* disabling vertical mouse)


*I did not test it yet