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Plugable USB to RS-232 DB9 Serial Adapter: does it provide pos and neg voltages on the DB9?

Plugable USB to RS-232 DB9 Serial Adapter (Prolific PL2303HX Chipset):
RS-232 ports on a PC include + and - voltages. Does your adapter provide both + and - voltage, or only +?
Additionally, do you have drivers for windows 8 and 8.1? (I think I read it will not work with windows RT, which is not an issue for me.)
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