[Rack] minotaur is down

Jonathan Lassoff jof at thejof.com
Sat Jul 6 22:56:49 UTC 2013


So, I figured out that /dev/usb/lp0 is actually a line printer emulation device.
/dev/parport0 was still what I wanted (99, 0), but udev wasn't creating it.

I manually did a mknod for it, but now just need to figure out how to
get it to survive reboots.

--j

On Sat, Jul 6, 2013 at 2:12 PM, Jonathan Lassoff <jof at thejof.com> wrote:
> On Sat, Jul 6, 2013 at 3:17 AM, Jake <jake at spaz.org> wrote:
>> we have been spamming the discuss list with this stuff.  no more.
>
> Oh... yeah, I suppose rack@ is more appropriate.
> However, I think we're more on-topic in this thread than most of the
> other threads :p
>
>> it may be an issue of the old hardware having a "real" parallel port that we
>> never used, because we didn't have a connector for it, and the new hardware
>> doesn't have a real parallel port.
>
> Certainly possible.
> However, since it's the USB emulator in both cases. I'm unsure exactly
> what is breaking.
>
>> make sure you're talking to the right device, which is a USB parallel port
>> which is tied to the sprinkler pipe just above the wall-o-tubes.
>>
>> i guess you're looking at /dev/usb... so it should be the right device.
>>
>> it must be something about the new OS install, different drivers for the usb
>> parallel port or something fucked up like that.  good luck.
>
> I think I'm talking to the right device. Both kernels used the uss720
> driver, however I was getting at it as /dev/parport0 (hard-coded into
> gateman :( ), whereas now there seems to be a device at /dev/usb/lp0.
>
> It's major number 180, minor 0, which the device listing
> (http://www.mjmwired.net/kernel/Documentation/devices.txt#2531) shows
> as 0 = /dev/usb/lp0 First USB printer.
>
> I wonder if I'm trying to bit-bang to something that is supposed to be
> a printer, and that is getting in the way.
>
> I'll keep hacking and experimenting. Any kernel hackers looking for a
> short exploration are encouraged to get in touch.
>
> Cheers,
> jof


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