JM> Hola Tim!
 
Howdy!
TH> I want to control the DSR and/or the CTS line of a serial port
  > that a serial mouse is connected to. When I probed these pins, I
  > found some unexpected things.
JM> What do you want to do with the mouse ?
Nothing. I want to use some of the output lines of the serial port the
mouse is connected to. Specifically, to power off the computer.
TH> I want to avoid direct register manipulation, but if someone
  > knows the programming model of the 8250, I'll consider it. My
  > concern is compatibility. It *must* work with all PCs.
JM> Direct manipulation is the only way :-( But this method is
  > compatible enougth. All 8250, 16450 and 16550 supports the same
  > control lines, and control protocol...
 
TH> PS - how does a serial mouse get its power. My guess is the
  > toggling state on the TD line. But that's just a *guess*.  :-) Do you want to detect a mouse attached ? :-)))
No. A mouse connected is assumed. I have since probed around a few
mice. It's not the same for all mice.
Thanks for your reply.
Merry Christmass!
 
___ Blue Wave/QWK v2.12
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