9V DC @ 0.6 A, Centre Polarity: +ve (inner diameter is 2.5 mm)
You can use the original Specturm power supply with the polarity reversed.
9V DC @ 1.6 A and 12V DC @ 0.9 A
This current allows to power an Atmos plus two Microdisc units (a Master and a Slave), each equipment having its own regulator to extract +5V from the 9V.