I realize it's a tad off topic but I think Bjorn Ekwall wrote the first parallel port driver for Linux a long time ago. I worked with Bjorn in 2000 in the UK. Bjorn died from a Heart Attack around 2001. He was one of the Linux Pioneers. https://www.linuxjournal.com/article/5043
Search for his name and you mostly find a different Bjorn. Sad that he doesn't show up more easily with Google. I miss our discussions John Dammeyer > -----Original Message----- > From: Joe Hildreth [mailto:[email protected]] > Sent: July-11-18 1:37 PM > To: emc-users > Subject: [Emc-users] Parallel Port Driver Docs > > Hello all, > > I have been working on a series of tutorial videos on YouTube on CNC for > the Home Hobbyist.� In the tutorial I am currently working on, I am > discussing the parallel port.� I want to give as accurate information as I am > able.� My question is about the documentation found at [ > http://linuxcnc.org/docs/2.7/html/hal/parallel-port.html | > http://linuxcnc.org/docs/2.7/html/hal/parallel-port.html ] This > documentation primarily talks about adding additional Parallel ports to > LCNC.� It states that there are three modes in which LCNC can use a PP.� > These are in, out and x.� It also provides a chart showing the pin direction > based on the mode that the port is set in. > > On this chart or table, it shows for the "in" column that pin 14 is an input > pin.� I think this is in error and should be labelled as an output.� To test > my > theory, I installed a second PCI PP in a computer and run the stepper config > wizard. I set up the first port as output and the second as input. > > In both output modes and input modes (for the ports) pin 14 is labelled as > an output pin.� This would make sense considering that pins 1, 14, 16 and 17 > belong to the control group. > > So if this is correct, then the documentation needs to be updated to reflect > that.� If I am incorrect, can someone explain why this pin is input when the > mode is set to input? > > I also understand that in mode x, that the control port (pins 1, 14, 16 and > 17) > are set to inputs but at risk because the physical pins on the port may not be > open collector. > > If you are interested, the play list for the tutorials can be found here: [ > https://www.youtube.com/playlist?list=PLaamliiI72ntlrHKIFjh2VjmehRGgZp > jm | > https://www.youtube.com/playlist?list=PLaamliiI72ntlrHKIFjh2VjmehRGgZp > jm ] I have 9 tutorials there and working on number 10.� The idea behind > them is to give enough information over time that a new hobbyist can get > into some form of CNC.� Rather than giving specific case examples, I want > the information to be applicable to whatever they are wanting to set up.� > Router, mill, plasma, lathe, 3D printer or whatever.� Constructive criticism > is welcome, but I do give a disclaimer.� I am not a teacher, engineer or a > machinist.� Just a home hobbyist who wants to give back to the community. > > Thanks for your help and input.� It is greatly appreciated. > > Joe Hildreth > ------------------------------------------------------------------------------ > Check out the vibrant tech community on one of the world's most > engaging tech sites, Slashdot.org! http://sdm.link/slashdot > _______________________________________________ > Emc-users mailing list > [email protected] > https://lists.sourceforge.net/lists/listinfo/emc-users ------------------------------------------------------------------------------ Check out the vibrant tech community on one of the world's most engaging tech sites, Slashdot.org! http://sdm.link/slashdot _______________________________________________ Emc-users mailing list [email protected] https://lists.sourceforge.net/lists/listinfo/emc-users
