Installing Windows NT 3.5 on Qemu
From Computer History Wiki
CPU
Windows NT 3.5 suffers from the same CPU identification issue as NT 3.1
You need to edit a string in the files INITIAL.IN_ and SETUP.IN_
Open each one in notepad and search for: [ProcessorVar]
Then change the string below it from
STF_PROCESSOR = "" ? $(!LIBHANDLE) GetProcessor
to
STF_PROCESSOR = $(ProcessorID_I586)