a.k.a. MS1823/MS1824 which is product name in SHARP the OEM supply destination
2 variations being known:
YM2423B-X (MS1823)
YM2423B-Y (MS1824)
However, different between these two is still unclear.
Identical with YM2413 other than preset voice
Preset Voices:
DIP18
Identical with YM2413
Philips PMC100
FM Melody Maker (for Atari ST)