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PCM is Pulse Code Modulation, the method of digitizing audio signals into fixed-bit-rate data streams. This is how the CD Audio format is encoded, as well as Digital Sound on laser discs, Wave files on computers, etc.
On that VCR, the PCM setting would turn it into a very-high-fidelity stereo audio tape recorder, by using the bandwidth of the video space on VHS tapes for the encoded audio instead of recording video. Sony first made add-on PCM encoder/decoders for some of its Beta VCRs in the early 1980's. These add-ons cost more than the VCRs themselves, if I remember right. If that Toshiba has the circuits built in, it is an unusual machine indeed.
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Chris
Quote from another forum: "(Antique TV collecting) always seemed to me to be a fringe hobby that only weirdos did."
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