TIL UMC, among many other clone chips in the 90s, also made full-on 486 processors
the UM3567 offers a pretty bang-on implementation of Yamaha's OPLL, to the point it can be used in place of the YM2413 almost directly, only requiring a pin conversion and the removal of the original circuit's LPF on the output (because of the DAC)
the UM3567 however had a more native application... video gambling machines. So popular in numbers in fact, that these days it's easier to grab a new old stock UM3567 than it is to try to source a legitimate YM2413 still working.