To control a device connected to the /dev/ttya serial interface of a sparc station, -12 volt is needed to pin 4. Does anybody have a idea, how can I do it with Software? Is it possible at all? [[Ed's Note: You might be interested in v9n48, the odds don't look favorable. -bdg]] Rui Zhao e-Mail: zhao%cadlab at uunet.uu.net or zhao at cadlab.uucp