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The DS89C21TMX/J7002999 is a variant of the DS8921 series, manufactured by Texas Instruments. This device is likely a digital interface component designed for use in applications involving ST506 and ST412 interfaces as seen from its historical context (DS8921AMX/NOPB). However, specific details on the TMX/J7002999 marking indicate a custom or specialized version with possibly different features, packaging, or specifications tailored to a particular customer's requirements. For accurate technical information and circuit design, refer to the manufacturer's datasheet or contact TI directly. Please note that "DS89C21" might not be a standard
