== External power supply ==
The official external power modulator provides +20V,-20V DC with 500mA (believed to be un-smoothed), from a source of ~220V at 50Hz.
The extenal power modulator is connected to the computer's internal power modulator, which generates a smoothed 12V and 5V outputs and these provide the power for the IC's.
The internal power supply is very tolerant and the computer will run with input voltages as low as 6V, but the colours in the palette are weak. If the voltage is increased, the colours become strong, and around 18V-20V, they are all correct. If a low input voltage is used, it is likely that the 12V power output on the expansion connector will not be correct.
The connector is believed to be a Telefunken Line socket (Maplins catalogue reference: FT99H). If you can't find this connector then you can make a suitable connector using a power lead and a sharp craft knife.
== Software differences ==
