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Lowell Heddings, better known online as the How-To Geek, spends all his free time bringing you fresh geekery on a daily basis. You can follow him on Google+ if you'd like.
This is Half Life, with a Super Mario mod/map… Nice !
i like to see them again it is really fun game
The idle (nominal) voltage on a telephone line is ~48 volts DC, but ~90 volts of 20 Hz AC current is superimposed over the DC voltage already present on the idle line in order to trigger the phone ringer and alert the user to an incoming call.
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