That would be the place with the very distinctive sign out front (though the chicken- or is it a rooster- has lost some of its luster since I last dined here pre-pandemic a few years ago.)
Biddie Banquet is located at 220 John C. Calhoun Dr. not too far off Interstate 26 (if you're passing by).
This is a quaint place that does not seem to have a website. Unusual for the times. So I'm linking what Trip Advisor says about it.
I first learned of Biddie Banquet three or four years ago when then Charleston Post and Courier food writer Hanna Raskiin included the establishment in a big spread she did about where to find the best fried chicken in South Carolina.