The features available via the keypad are mentioned in the Spectrum 128 Introduction Manual that was included with every machine sold. The service manual for the Spectrum 128 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.
|Spectrum 128 Introduction Manual|
The Introduction Manual contains the following details relating to the keypad:
Setting Up - Page 3:
Getting Started - Page 4:
128 BASIC - Page 7:
Using The Calculator - Page 8:
|Spectrum 128 Service Manual|
The Service Manual specifies the offical names used for the various states in the keypad communications protocol.
Section 1 - System Description:
This section also contains the circuit diagram of the keypad (Figure 1.7):
Section 5 - Parts List: