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.
Siel DK 70, DK 80, EX 80, DK600, DK700, Opera 6, Elka OMB-5, Drumstar 64, Drumstar 80, Jen Synx 508.Attention: Siel Synthesizers mostly use TMS7000N2L-2 which has a 1.778mm pin pitch. Jen Synx 508 also used the small pitch version.