You can't on the older system 1/80 transformers if it's a standard US 110volt unit.
That's not correct Nick... You
can change the transformer wiring on both the System 1 and 80's to either 110V or 230V (and a few other voltages). The transformers are designed for it.
What's the name of the game Clive? I have most of the manuals here so I should be able to give you instructions on what wiring needs to be changed...
