Great article. Thanks for sharing. Joe
----- On 11 Jul, 2018, at 16:31, John Dammeyer [email protected] wrote: > 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 ------------------------------------------------------------------------------ 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
