ah, it wasn't clear to me, so I just wanted to point out exactly what the floppy was supposed to pass to the system.
NT4 was magical, I remember reading on the jewel case "for 386, Pentium Pro, MIPS, PowerPC, Alpha" or something like that, and the instructions on how to boot the installer - with only PC referencing a boot disk (and having done so before ElTorito that was truly magical for me)
I've installed NT4 god knows how many times. I'm very familiar with the process.