24    IBM Desktop System HMM
Operating Requirements
All machines require two power inputs: one for the 
system unit and one for the monitor display. 
The system unit comes with a voltage selector switch, 
allowing selection of voltage of either 115 Vac or 230 
Vac. This switch must be in the 230 Vac position 
when the machine is plugged into a 230 Vac electrical 
outlet. 
The required power input for the monitor (Not 
included with some models) shipped with the system 
unit is auto-sensing type and does not require any 
voltage switch adjustment.