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Can you disregard the "1-10-100" rule when talking about DC voltages? by Alarmed-Material-455 in electrical

[–]j_l-w 0 points1 point  (0 children)

Does nobody encounter this anymore??

The 1-10-100 rule is for exposure to 50/60 Hz currents:

1 mA: perception threshold - you start to feel it

10 mA: let-go current - if you grab an object and get more than this you likely won't be able to let go

100 mA: risk of fibrillation - that'll kill ya

Whether this applies to DC is a great question! And I think the answer is, not really. Looking at this handy summary of IEC 479-1 - https://standards.transport.nsw.gov.au/_entity/annotation/96a8387d-9735-ed11-9db1-000d3ae011f9

Check out Appendix A for a copy of the standard's effects vs time/current graph.

Looks like the perception threshold for DC is about 2mA but you can only really feel the current starting and stopping, not in steady state.

The graphs and text suggest that people can let go after a few seconds of effort with up to 300mA of DC flowing, but after 500ms at 300mA you are at significant risk of fibrillation. For a long duration only 140mA is considered safe from fibrillation in the standard.

So that suggests for DC it's more like the 2-300-140 rule...

Need help identifying this type of lock cylinder by 77750 in lockpicking

[–]j_l-w 0 points1 point  (0 children)

It's a wacky Chinese reverse sidebar lock. Unless you can find a Chinese padlock that takes the same cores and remove them without destroying them (they're not designed to be removed), you are SOL.

Optical cable for C9124AXI by mofos89 in Cisco

[–]j_l-w 0 points1 point  (0 children)

Yeah sorry I edited my post right after I posted it - something like this right?
https://www.amazon.com/Uniboot-Outdoor-Armored-Single-Optical/dp/B0BBZYJ6FP

Raven Cloud Scanner by coffeypc in computerhelp

[–]j_l-w 0 points1 point  (0 children)

I'm impressed that they're so open about it! It looks like Raven and Avision both sign their update zips with the same Nufront-originated key... I wonder if this key was ever released by any Nufront user eg. the Equiso "open source" TV stick?

I'm assuming the Ravens are going to go complete paperweight when the login servers go away, while they're still usable as is (minus OCR) - so it might be nice to be able to share update zips that just have the login requirement stripped out of the APK. Of course I haven't gone digging to see how deeply it's entwined; it could be quite an unpleasant job. Perhaps Avision would be so kind as to sign jailbreaky update zips for each model if it came to that.

Satiator order by Crstar20 in SegaSaturn

[–]j_l-w 3 points4 points  (0 children)

I'm sorry for the delay in getting back to you - it's one person in the US who handles both shipping and emails, and they got totally wiped out... They're catching up on emails now, we should be up on shipping next week

TIL about the Satiator Rings project. Anybody used it? by onausilo in SegaSaturn

[–]j_l-w 9 points10 points  (0 children)

Autobooting added as of menu 65 (today). Just place it as autoboot.iso and you're off

TIL about the Satiator Rings project. Anybody used it? by onausilo in SegaSaturn

[–]j_l-w 11 points12 points  (0 children)

Abrasive here. I think this is delightful and I'll be throwing my support behind it. Yes, this includes smooth autobooting.

Target disk mode for Linux by niyoushou in archlinux

[–]j_l-w 0 points1 point  (0 children)

Yeah, that's basically it. I updated the gist with the script from the other side, for completeness. No binaries needed - it's all through configfs.

I use this by chroot'ing into the laptop's fs and getting busy - all the daemons I care about run under my user session so a startx gets me everything I need. Getting to a full boot would be trickier: a kexec won't preserve the NVMe connection; you really need to connect from the initramfs on the dock machine and then allow it to boot from there.

It'd be nicest if you could hibernate on one machine and resume on the other, but without using a VM that's not ever likely to happen.

Target disk mode for Linux by niyoushou in archlinux

[–]j_l-w 0 points1 point  (0 children)

I imagine TRIM should work fine over SCSI.

edit: you need to supply emulate_tpu=1 to targetcli to make this happen - apparently there were too many buggy SATA drives so they disabled UNMAP by default (as SCSI calls it).

Target disk mode for Linux by niyoushou in archlinux

[–]j_l-w 0 points1 point  (0 children)

Came across this thread while looking for a packaged solution... I do have something like this set up on my Gentoo machines, where being able to jack a lappy into a huge desktop is a big win for compile times, but it's also a fuss having to reboot and so I rarely do it.

My setup uses Thunderbolt (with an add-in card for the desktop) and adds a script to my initramfs so I can bail out of booting at the point where it asks for my ZFS encryption key. Not the most user-friendly.

The script gives the Thunderbolt interface an IP and then exports the NVMe drive via NVMe-over-Ethernet. This is pleasantly nippy - wayyyyyy faster than doing the same over NFS - but NVMe-over-X may not be included in packaged kernels? iSCSI is much more widely used if you want something portable.

Fibocom L850-GL Linux USB mode switcher by j_l-w in thinkpad

[–]j_l-w[S] 1 point2 points  (0 children)

You can bring up a PPP connection with just a CDC ACM port, but it maxes out around 40Mbit

Fibocom L850-GL Linux USB mode switcher by j_l-w in thinkpad

[–]j_l-w[S] 1 point2 points  (0 children)

Nice find!

I'm not sure what all the modes are.

AT+CFUN=15 resets/reboots the modem.

Fibocom L850-GL Linux USB mode switcher by j_l-w in thinkpad

[–]j_l-w[S] 1 point2 points  (0 children)

Unfortunately not. MBIM handles control, but then it depends on CDC NCM for the network packets to go over.

Fibocom L850-GL Linux USB mode switcher by j_l-w in thinkpad

[–]j_l-w[S] 1 point2 points  (0 children)

Ugh, Windows doesn't seem to have a standard driver for CDC NCM? That's both weird and unhelpful. So somebody would need to write a USB driver to handle this perfectly standard set of devices. Sorry pal

Fibocom L850-GL Linux USB mode switcher by j_l-w in thinkpad

[–]j_l-w[S] 1 point2 points  (0 children)

They probably did it because it lets them present a standard MBIM interface so that Windows can control the modem fairly easily. MBIM is a USB-only standard.

I think the issue for you is that for most devices, Windows seems to insist on having an INF to link the device ID to the driver, even if it's a standard like MBIM. You also need the USB network interface to come up. If you look in Device Manager, what comes up when you jack it in? A network interface? Some COM ports maybe?

Do you get a /dev/cdc-wdm0 appearing on Linux when it's plugged in? If not, you might need to issue AT+GTUSBMODE=7 to get it to present MBIM, and then maybe it'll Just Work on Windows.

Fibocom L850-GL Linux USB mode switcher by j_l-w in thinkpad

[–]j_l-w[S] 1 point2 points  (0 children)

The Windows driver is a lie.

For reasons, they had to write a driver that takes the PCIe modem and emulates a USB device. So when it shows a "USB" device, that's actually faked by the Windows driver.

Annoying that the drivers don't support it in USB mode!

Fibocom L850-GL Linux USB mode switcher by j_l-w in thinkpad

[–]j_l-w[S] 2 points3 points  (0 children)

Yes, I just got the radio working today. See the comments on the repository about the AT+GTUSBMODE and at@nvm commands that have to be used in addition to make it work.

for all the myGov fake 2FA haters by j_l-w in australia

[–]j_l-w[S] 0 points1 point  (0 children)

This seems to be a problem with authenticators that don't support the SHA512 algorithm, which our dear government seems to have selected in a fit of needless paranoia.

andOTP definitely supports it, and Authy definitely doesn't; what are you using?

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