There are several ways; two of them come to my mind just now:
At operating system prompt type:
disp+work -V
Among the first few lines there will be 'compilation mode'.
In SAPGUI click system -> status
Look at the box 'SAP system data'; there will be a line 'unicode system yes/no'
In case this line isn't there: It is an old system from ancient pre-unicode ages.
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