Page "ZX Spectrum" Paragraph 18
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Planning of the ZX Spectrum + started in June 1984, and the machine was released in October the same year.
This 48 kB Spectrum ( development code-name TB ) introduced a new QL-style case with an injection-moulded keyboard and a reset button that was basically a switch that shorted across the CPU reset capacitor.
Early on, the machine outsold the rubber-key model 2: 1 ; however, some retailers reported a failure rate of up to 30 %, compared with a more usual 5-6 % for the older model.
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