I dunno if the SN76489AN is software compatible, but there's a few companies making modern AY-3-8910 (the sound chip in the Master System) equivalents. There's

I dunno if the SN76489AN is software compatible, but there's a few companies making modern AY-3-8910 (the sound chip in the Master System) equivalents. There's the JFC 95101, and I believe the Filfact KC89C72, though the origin of that one seems quite strange; zero information on the company that makes it or what else they make is out there.