I don't think the 74181 is implemented with a LUT. http://www.righto.com/2017/01/die-photos-and-reverse-engineering.html http://www.righto.com/2017/01/die-phot

I don't think the 74181 is implemented with a LUT. http://www.righto.com/2017/01/die-photos-and-reverse-engineering.html http://www.righto.com/2017/01/die-photos-and-reverse-enginee...