Hong Kong Console Power Supply

[b1aCkDeA7h]

I recently won a HK Famicom ( HVC-001HKG ) that was listed as untested and without an AC adapter. I know the specs on the OEM Nintendo Adapter ( HVC-002HKG ) are as follows:

MODEL HVC-002 HKG
AC200V 50Hz 17W
DC10V 850mA
+ ------ C------- -

I'm wondering what adapter would I need to be able to power on and test the system (in the US).

I can easily get a cheap AC adapter that outputs DC at 10v with 850mA current and negative polarity, but the difference in input voltage and frequency is making me paranoid. So, until I find a safe solution to test the system without frying it, I'm going to leave it alone.

Suggestions?