Hi Roy.

03-Oct-03 12:06:09, Roy J. Tellason wrote to Paul Rogers


 RJT> Paul Rogers wrote in a message to Matt Mc_Carthy:

 MM>> to the PS fan, so that covers that one.  I don't believe anything
 MM>> has used the (-5V) line since the days of the 16K RAM chips!
 MM>> :-)

 PR>> I know a lot of interfaces have cheated, but RS-232 is supposed
 PR>> to be +v to -v, v=5 to 15v or so.

 RJT> I think that's about the only thing that uses the -12 supply any
 RJT> more,

I've got a VGA card here that doesn't produce a usable signal without -12V

 RJT> and even there,  the task of generating a few mA of -12
 RJT> with a chip is real easy these days,  has been for a number of
 RJT> years...   See "max-232" and similar chips

yeah, they produce about -9.5 which is close enough I guess.,





 -=> Bye <=-

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