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I'm not familiar with that 12 volt system on those old mouses. I do know that there aren't just two pins and you get 12 volts from there. You have to surf around the net and try to find more information about this yourself. Sorry.

Never mind, Thanks anyway.

Hi Im just come across this wicked site, but I just wanted to know if I have a serial mouse and 12V fan can I just connect it up directly to the cable? I have 4 wires connected to the mouse, RXD,TXD,GND and RTS. I know where to connect ground, but what about the 12V?
THanks in Advance.

It is quite hard to get that 12 volt from the serial mouse because the 12 volts is made out from those signal lines and their current. I'm not quite sure how this process goes but it is quite difficult task to get that 12 volt to power up the fan because the current wouldn't be that high etc. You should be able to find that voltage with a multimeter somehow but because I don't have any of those mice left I can't test that myself.

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