Sinclair Spectrum128 Keypad

Posted on Feb 6, 2014

The features available via the keypad are mentioned in the Spectrum128 Introduction Manual that was included with every machine sold. The service manual for the Spectrum128 is aimed at repair technicians and describes the circuitry and communications protocol used by the keypad. Extracts from both of these documents are reproduced below.

Sinclair Spectrum128 Keypad
Click here to download the full size of the above Circuit.

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