Date: Sat, 9 Dec 1995 02:21:11 -0500 From: Gene Stark <gene@starkhome.cs.sunysb.edu> To: kelly@fsl.noaa.gov Cc: freebsd-questions@freebsd.org, smp@csn.net Subject: Re: tw driver Message-ID: <199512090721.CAA19178@starkhome.cs.sunysb.edu> In-Reply-To: <9512090639.AA24593@emu.fsl.noaa.gov> (kelly@fsl.noaa.gov)
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>I'm trying to get the tw driver to work but haven't had any luck. It >won't detect the TW523 connected to the parallel port. >- Rebooted. The probe repeatedly calls wait_for_zero(), which never > finds the zero crossing signal. Eventually it gives up. I assume the TW-523 is plugged in the wall, right? (first things first) >- Built a connector for the parallel port according to the directions > on http://www.freebsd.org/~faulkner/multimedia/HomeAuto/Tw/tw.html. > > With one small modification: RJ-11 pin 1 (black) goes to both > DB-25's pins 12 and 17. The tw source code says it looks at pin > 17, but the web document mentioned above talks about 12 being > preferred, while 17 is backwards compatible. The document you cite was written after FreeBSD 2.0.5, and it refers to a version of the tw driver that Rich Murphey worked on a few months ago, but which as far as I can see was never committed to FreeBSD-current. The version that is in FreeBSD-current does not have Rich's modifications, including the pin 12 stuff. I personally am using the driver that is in 2.0.5 (and have been for a couple of years). However, Rich was not able to get stuff working with the sync line on pin 17, and was forced to switch over to pin 12, with some modifications to the driver. Best would be if you can get Rich Murphey or Steve Passe to send you their copy of the driver. I can probably dig one up out of my back mail files, but I don't know whether it would be the final version that they arrived at. If you don't have any luck getting it from them mail me back direct and I will look for it. - Gene Stark
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