Keypad
The only peripheral supplied as standard was the little numeric keypad shown here. The cable ends in a 7 pin DIN plug, the signals are roughly 2 for power and a 5 bit code to indicate which key is pressed,
The keyboard signals go to an SAB3012 chip on the logic board which then sends a serial bitstream to the remote control signal interface of the SAA5070. I am not conviced this is the simplest way to do it.
Keypad
The only peripheral supplied as standard was the little numeric keypad shown here. The cable ends in a 7 pin DIN plug, the signals are roughly 2 for power and a 5 bit code to indicate which key is pressed,
The keyboard signals go to an SAB3012 chip on the logic board which then sends a serial bitstream to the remote control signal interface of the SAA5070. I am not conviced this is the simplest way to do it.