Hey guys, I've got a little electronics project I'm working on, and I need to send pulses out from a PC that's got Red Hat 9. I thought the data strobe on the parallel port would be a perfect way to do this, and I'd like to avoid writing "real" program, so I'd like to do it using a shell command. The external device takes TTL levels, which are abundant on the parallel port. I'm hoping to use just two wires. I tried changing permissions on /dev/lp0 to a+wr and doing "echo > /dev/lp0", but it didn't work. "echo > file" puts just a newline in file. One byte. Echoing to the port hangs, perhaps waiting for an acknowledgement. I've also tried looking around for a HOWTO, but it's so involved and requires programming (which I can do, but would like to avoid). I'd appreciate it a lot if someone would point me to a site I can read to knock this out. Thanks. Chris Schumann (Hmmm... maybe I can connect the STROBE to ACK pin...) _______________________________________________ TCLUG Mailing List - Minneapolis/St. Paul, Minnesota http://www.mn-linux.org tclug-list at mn-linux.org https://mailman.real-time.com/mailman/listinfo/tclug-list