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The urge to 'be professional' led to many mutations. The PBS Executive IV is executive because it's built into a briefcase.
This, however, cannot disguise its true nature, which is a Spectrum+ with thermal printer and Microdrive storage: without a display, it is not entirely clear how it was supposed to work. Nothing else is known of this odd creation, hence the plaintive sign: if you know of (or even better are) the mystery PBS, let us know and we'll make a Spectrum collector a very happy man.