Ensoniq ESQ-1, ESQ-M, Korg 01/W and M1 family, Sequential Circuits Drumtraks
This chip was initially created by SSM (Solid State Micro Technology for Music) but later in 1988, they sold the rights to PMI (Precision Monolithics, Inc). PMI also sold the rights in 1991 to Analog Devices. Analog Devices does not produce it anymore but you will find them with those different brands and they all are the same product.
Used in: Ensoniq ESQ-1, SQ80