TDK MAR-C90 (c. 1981)
Little is documented about the TDK MAR-C90 — the surviving record is essentially a handful of classified ads. Audio (August 1981, p.78) listed the MAR-C90 at $11.99 in a FOR SALE block alongside the TDK D-C60 (at $1.35) and D-C90, and similar entries appeared in the September and November 1981 issues (p.96, p.90). That is almost everything.
No period review, brochure, or spec sheet for the MAR-C90 has surfaced, and no source seen so far states outright what the product was. The "C90" name and the company's cassette lineup suggest a blank tape, but that's inference from the ad context rather than a documented fact. If you have packaging, a manual, or an actual example, it would fill a real gap.
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