Well to be serious the X68000 is a computer system in Japan, a higher class than the MSX, which is another Japanese computer system.
It's quite a very popular system in Japan so that every serious programmer aspires to have one at it's release, if you don't have much money, buy the MSX instead. It's also the official development/programming kit at Capcom for a very long time, so the X68000 has perfect arcade ports of Capcom games at that time as well.
And since there's no parental limitations and guidelines for the system, there's also a lot of hentai games on it.
I accidentally knew about the X6800 because when I was young in the Philippines, I tend to find/buy pirated PC CD's containing a lot of PC games with a side of hentai games contained in a single CD. When I researched about it when the internet came about, I discovered nearly all of them are ported from the X68000 and translated into Chinese for the Chinese MS-DOS market.
A semi popular hentai game in the US is Knights of Xentar, in Japan, it's called Dragon Knight 3, and there are four Dragon Knight games released in Japan. I highly recommend Dragon Knight 4 because it's basically Fire Emblem with hentai (With an awesome "New Game Plus" that is canon to the story.)