UMC is also known for such things as:
- the 2A03 clone UA6527 which powered certain famiclones in the early 90s
- a very cheeky YM2413 clone, UM3567, which *improves* on the original Yamaha design by having a true DAC on the output stage rather than multiplexing the channels
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)