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The Cosmo's rack-mounted equipment, including the two SPUs and six PDUs. Photo courtesy of Casio.

A prototype synthesizer created by Casio for Isao Tomita in the early 1980s. The Cosmo consisted of:

Everything except the MIDI keyboard, and the computer and its peripherals, was enclosed in a 19" equipment rack. The SPU was a 12-bit sampler that sampled at 40 KHz; with 128 kilowords of memory, it had a total sample recording time of a little over three seconds. Each one was 4-voice polyphonic; the two could be operated together as a multimbral pair with each voice playing a separate sample and patch, and assigned to 1 of up to 8 split keyboard zones. The outstanding feature of the sampler was that the computer had direct access to the memory of both samplers via a shared-memory bus, which allowed software to edit the samples in memory. Operations such as loop point finding, filtering, sample splicing and editing, and drawing waveforms could be performed by the computer.

The PDUs were essentially prototypes of the soon-to-be-released CZ-101 synth, with very similar capabilities. They were possibly implemented using discrete logic, as a pathfinder for the application-specific integrated circuits for the CZ-101 and later models, which would account for their larger size. Only one of them had a control panel, which controlled all six. The computer could also control the PDUs, doing patch editing and sequencing.

Only one Cosmo was built. Tomita is known to have used the system on his album Dawn Chorus. The PDUs, as discussed above, served as the basis for Casio's 1980s line of phase distortion synths. The samplers were developed into a model called the ZZ-1; however, this never went into production. The Cosmo is now back in Casio's possession in Japan.