I sat before a second-hand 20" 1280x1024 monitor in 2001. And it was old (as in >5 years) at that point. then there was Iiyama Vision Master Pro 514 with 140-i

I sat before a second-hand 20" 1280x1024 monitor in 2001. And it was old (as in >5 years) at that point. then there was Iiyama Vision Master Pro 514 with 140-ish kHz horisontal scan