Note that Dosbox-X is VAST. And some programs simply won't work with the default setup and you have to configure.
But once understood, it is very powerful.

Another fork, offering great options but being less complicated, would be Dosbox-Staging - also highly recommended.

PS: write down any setting before doing changes

As pictured in this closeup, the convergence (where the blue, green and red beams meet), is a little off - blue is too far to the lower right, resulting in a blurry picture. No sharpness parameter can fix that!
Newer CRTs let you adjust convergence via menu.
"Colour Grid" in VTB is great for that.

This is the DOS version. MD looked a little different

My preferences depend mostly on what I grew up with... in this case, it was EGA <3

Why not NTP over the internet? Besides the advantage of being self dependent with RighTime, NTP could fluctuate quite a bit in the early 90s, well over a tenth of a second at times.
My guess is that RighTime was used to synchronise systems with a local NTP server in a LAN.

"The program has found application in a wide variety of industries, including astronomy, satellite tracking, communications, broadcasting, transportation, public utilities, manufacturing, medicine, and the military."

ntrs.nasa.gov/citations/19...