#linuxcnc-devel Logs

Mar 13 2018

09:55 AM seb_kuzminsky: jepler: i think we should move that spreadsheet to the infrastructure git
11:00 AM seb_kuzminsky: jepler: and merge it with http://wiki.linuxcnc.org/cgi-bin/wiki.pl?RolesAndResponsibilities
11:07 AM jepler: seb_kuzminsky: that is fine by me
11:11 AM skunkworks: http://electronicsam.com/images/house/trackpress.JPG
11:11 AM skunkworks: the little holes are 1 inch
11:12 AM skunkworks: they were rigid tapped - the 1.75" holes were thread milled. (home made tool)
11:19 AM jepler: how deep, 2 or 3 inches?
11:23 AM cradek: that's awesome
11:23 AM cradek: what is it?
11:24 AM skunkworks: 2 inches deep (thick)
11:24 AM skunkworks: it is an end cap for a cylinder dad is making. (crawler track pin press)
11:25 AM cradek: that's a whole lotta aluminum
11:25 AM skunkworks: steel
11:25 AM cradek: ooh
11:26 AM cradek: huh for some reason it looksl ike aluminum to me
11:26 AM skunkworks: i think it started out as a gear
11:45 AM jepler: seb_kuzminsky: .. I didn't know about that wiki page, and I had forgotten the stuff still at SF (mailing lists). whoops.
11:50 AM skunkworks: (dad has to get the crawler back together before summer so the kids can rid on it ;) )
12:40 PM JT-Shop: pcw_home: is there two different 4i24 cards one 72 bit and one 96 bit?
01:19 PM jepler: 4i24? that looks like a veritable dinosaur. No FPGA ? PC-104 ISA bus? eek
01:23 PM jepler: but hey it gave me a good laugh when I went a little bit down a bunny trail. Scroll way down to figure 24 on page 16: http://www.embeddedsys.com/subpages/resources/images/documents/82C55_datasheet.pdf
01:24 PM jepler: I dunno why we make everything so complicated
01:29 PM JT-Shop: basic floppy disk interface
01:29 PM jepler: that's figure 23
01:51 PM pcw_mesa: 4I24= 1980s tech we still make them and people still buy them
01:52 PM pcw_mesa: there are three versions, the 96 bit (plain 4I24) being the most common
01:54 PM pcw_mesa: we did a CPLD (8255 emulation) version until 5V CPLDs became unobtanium
01:54 PM JT-Shop: thanks
01:55 PM pcw_mesa: AFAICR the 8255 is a 8085 peripheral
01:56 PM pcw_mesa: not sure where they make current 82C55s now, must be 3 u tech or so
02:14 PM rene-dev: pcw_home http://www.myirtech.com/list.asp?id=565
03:37 PM pcw_mesa: kind of like the parallela without the FP chip
04:01 PM jepler: forum updates incoming
04:01 PM jepler: with any luck they fix some of the regressions that andy and jt were reporting from forum users :-/
04:01 PM jepler: I don't remember exactly what those were though
04:02 PM jepler: should fix the session management problem that had eventually made the admin UI glacial
04:03 PM jepler: no kunena update, that's the one that's needed to fix the forum edit bug
04:33 PM skunkworks: so - I installed the stretch iso on a laptop for testing - how to I switch it to sim so that I don't get realtime errors? I thought it was a different source package - but it seems sim and rt_preemt are lumped together. Is it as easy as changing kernels? (how do you do that?)
04:34 PM jepler: skunkworks: that's an excellent question!
04:35 PM seb_kuzminsky: skunkworks: you can use apt to switch kernels
04:36 PM seb_kuzminsky: apt-get install linux-image-rt linux-image
04:36 PM seb_kuzminsky: will install both
04:36 PM seb_kuzminsky: then when you reboot you can pick the rt or vanilla version
04:36 PM jepler: yes I think seb_kuzminsky is right. If you boot the -rt kernel AND rtapi_app is setuid root, there's no way to request it run in "sim"-type mode
04:36 PM jepler: you could remove the setuid bit from rtapi_app via sudo chmod, but that would get put back anytime the package is reinstalled or upgraded.
04:37 PM seb_kuzminsky: the package names are actually linux-image-rt-amd64 and linux-image-amd64
04:37 PM jepler: or you could use an RIP build and omit the "sudo make setuid" step
04:37 PM skunkworks: sure - ok - So I have a bunch of options :) thank yous guys
04:38 PM seb_kuzminsky: only one option - don't do what jeff said, it's crazy
04:38 PM skunkworks: heh
04:38 PM jepler: yes, don't "remove the setuid bit from rtapi_app via sudo chmod"
04:38 PM jepler: it's a bad idea
04:39 PM jepler: using an RIP build is not such a bad idea honest
04:39 PM seb_kuzminsky: yeah that option is good
04:53 PM skunkworks: I might (in this situation) switch kernels. It will never be used for realtime...
04:54 PM seb_kuzminsky: i've done that, install with jepler's linuxcnc iso and switch kernels, it works well
04:54 PM seb_kuzminsky: you can remove the -rt kernel so grub never picks the wrong one
04:54 PM skunkworks: Then I don't have to worry about updating the RIP
04:54 PM jepler: yes, just don't remove the -rt kernel until after you know the other one boots
04:54 PM seb_kuzminsky: right, just keep using the uspace debs from the buildbot
04:57 PM skunkworks: this is so dad can test programs without bringing up the machines
04:57 PM skunkworks: :)
04:57 PM skunkworks: an old studio laptop - dual core or core 2 duo.. Don't remember
04:57 PM jepler: somebody should write a program specially for that
05:25 PM skunkworks: yay - boots and works still
05:39 PM seb_kuzminsky: magic!
09:22 PM jepler: starting to switch my personal DNS from selfhosted to digitalocean
09:23 PM jepler: since I suggested doing it for linuxcnc.org I figured I should take my own medicine
09:37 PM Tom_L: was it cherry or grape flavor?