3.5 Cassette interface Output impedance Less than 1k ohms Input impedance Greater than 100k ohms Output level Nominal 200mV peak to peak, 70mV RMS Dynamic input range Nominal 50mV to 5V peak to peak, -25 to +15dB 0dB = 350mV RMS Motor control By miniature relay within computer Contact rating 1A at 24V DC Baud rate 300 or 1200 baud using standard CUTS tones (1200 and 2400 Hz tones) Connector 7-pin DIN 3.6 Analogue to digital convertor Resolution 10 bit Full scale input voltage VREF VREF 1.8V typical Accuracy (with respect to VREF) full scale error 0.5% typical zero scale error 0.5% typical Non-linearity 0.1% typical Temp coefficient -6mV/degree C typical Conversion speed 10.0ms per channel typical Input impedance > 1M ohms 3.7 ECONET Line voltages 0.25V and 3V typical into 50 ohms 3.8 CENTRONICS compatible printer interface Data strobe 4us pulse 3.9 Audio output Output power 0.5W Speaker impedance 8 ohms 6