So I just discovered an otherwise uninteresting Chinese manufacturer of video game peripherals named Changxin. Their web site is
http://www.dgchangxin.com/.
Here's the interesting part, however, and how I found it: if I'm reading the Chinese text correctly, this company is the successor to a company called Bu Bu Da, also based out of Guangdong, and founded in 1998.
Rinkaku89 has
a dance game for Mega Drive made by that company in 1999, which he can't actually get to work. They're credited by their initials on the opening screen:
BBD. There's also
this hentai mahjong game that rinkaku has; although it's not credited under their Chinese name, it's likely the same company. And yeah, I assume this is probably the same BBD that developed Sintax's games, too.
Alas, they don't seem to develop software anymore, just hardware... and not even the interesting sort of stuff, either, just carrying cases and such. Oh, how the mighty have fallen.