Casio C-90
Surviving information on the Casio C-90 is thin, and what exists complicates the "synth" label in this archive's catalog. The period record points to a blank audio cassette, not an electronic instrument. Audio (September 1983, p.44) tested a C-90 at $4.79 and praised its consistency, noting a good match between the C-60 and C-90 lengths. A second Audio test that same month (September 1983, p.42) grouped the C-90 with Type I (ferric) tapes, priced one C-90 at $5.40, and described a competing tape as a close match for it.
Beyond those two review mentions, almost nothing is documented. No service literature, advertisements, or further editorial coverage has surfaced in the archive's holdings. Whether Casio marketed the C-90 as part of a broader tape line, and how long it sold, is unrecorded.
Known specifics:
- Appears to be a 90-minute (45 minutes per side) blank compact cassette
- Period pricing: $4.79-$5.40 per C-90, depending on the review
- Reviewed among Type I tapes in Audio, September 1983
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