zkms

31 ms·

241.
by zkms 9y ago
> Memory: 16 KB Instruction Cache, 16 KB Data Scratchpad This is about as anaemic as I am. When I can get RISC-V silicon with a DDR4 and PCIe interface, we'll be talking, but this is pretty weak stuff.
242.
by zkms 9y ago
> 60Hz commercial power, 40Hz LIRR power (Pennsylvania Railroad standard) 25Hz NYC Subway power, 700VDC Metro North power, 600VDC subway third rail power, and some old Edison 100VDC power. The only thing missing is 400Hz power!
243.
by zkms 9y ago
> I'm not willing to pay 35 bucks to read the IEEE article however. Me neither: http://ieeexplore.ieee.org.sci-hub.cc/document/6444314/
244.
by zkms 9y ago
Ah, the low-budget variation on the old classic -- the helicopter prison escape! https://en.wikipedia.org/wiki/List_of_helicopter_prison_esca...
245.
by zkms 9y ago
Now you're thinking with superresolution!
246.
by zkms 9y ago
Given how shoddy ( http://illmatics.com/Remote%20Car%20Hacking.pdf ) automobile software is, the idea of safety-critical components parsing radio broadcasts from other vehicles and acting upon that is very worrisome. I do not
247.
by zkms 9y ago
As people on /b/ used to say, "oh, exploitable".
248.
by zkms 9y ago
Is there documentation/examples for how to program the Alto's microcode?
249.
by zkms 9y ago
Will this be via low-power ADS-B or something else?
250.
by zkms 9y ago
> There's no fundamental reason that road vehicles couldn't exceed 200kph There sorta is. Air resistance and tyre/pavement rolling resistance get mighty expensive at that sort of speed, and the need to carry along energy s
251.
by zkms 9y ago
To quote a thread about that (cultural ideas around automobiles vs rail) I saw on twitter: "Americans tend to think that there's no way everyone would use trains unless forced to by lack of alternatives. This is projection because
252.
by zkms 9y ago
> It's slower than flying on a commuter airline, but the tickets cost nearly as much, and it's also enormously expensive to build High-speed rail in many non-US countries is vastly cheaper to construct and much faster and reli
253.
by zkms 9y ago
from http://ethernethistory.typepad.com/papers/EthernetPaper.pdf (1975): > Recognizing the costliness and dangers of promising "error-free" communication, we refrain from guaranteeing reliable delivery of
254.
by zkms 9y ago
> True, the success rate isn't very high, which is the direct result of the variability of whether each individual possesses the tiny bit of willingness to change, which is essential to the recovery process. "If our process has
255.
by zkms 9y ago
"Drug courts" don't help addicted people (nor the people around them) -- they're mostly a way for the criminal legal system to whitewash itself and pretend that it cares about drug users in a "medical" way (and
256.
by zkms 9y ago
Good. Now the tiny minority ( https://www.washingtonpost.com/news/dr-gridlock/wp/2016/03/0... ) of insufferable NIMBYs who spend all day lodging airport noise complaints have something real to complai
257.
by zkms 9y ago
> There's no open source network, graphics, peripheral and GPIO hardware that can be cheaply plugged into a synthesized design that can be sold at the price you want. Why not PCIe? Aren't there already a bunch of design/va
258.
by zkms 9y ago
At the very least, something with lots of wide fast DDR4 and lots of PCIe lanes.
259.
by zkms 9y ago
> I'd say U.S. banking is, if nothing else, generally at the forefront of digital technology despite heavy regulation. Transferring money with ACH takes multiple business days, this is not at the forefront of digital technology.
260.
by zkms 9y ago
> Most of the tube tunnels have above ground sections, so a hybrid idea is to use air conditioning in the trains when above ground, and while above ground to cool a block of “phase change media”, or water to you and me, into an ice pack.
261.
by zkms 9y ago
The tragic thing is that the wet-pipe fire sprinkler has existed for around 140 years -- this is 1880s-vintage technology! The fundamental design is very simple -- a network of pipes, pressurised with water (from a tank or the municipal wat
262.
by zkms 9y ago
If storage makes sense (if a consumer for the electricity can't be found), battery storage (or flywheel storage) will almost certainly be kept on the wayside and not on trains; that way you don't have to care about weight / v
263.
by zkms 9y ago
There's no need for storage nor batteries at all, though. It suffices to convert the energy from the DC rails (where the train dumps it) to a bus where every other accelerating train can draw current from -- since there's lots of
264.
by zkms 9y ago
A working fire sprinkler system would have slowed down fire incursion and would have significantly reduced loss of life; as sprinklers have in many other high-rise fires involving flammable cladding. However, even an external cladding fire
265.
by zkms 9y ago
https://www.sstic.org/media/SSTIC2017/SSTIC-actes/protip/SST... answers your question.
266.
by zkms 9y ago
You can do that, but you can also use it to power accelerating trains that live on every other track section / DC bus -- by inverting it back into AC and dumping that onto the AC grid that's used to supply your rectifiers.
267.
by zkms 9y ago
Offering DMA to devices can be good actually if you care about performance, and the security issues can be eliminated with a properly set up IOMMU in the mix.
268.
by zkms 9y ago
Per https://www.ianvisits.co.uk/blog/2017/06/10/cooling-the-tube... there already is regenerative braking on some cars, the issue is that regenerative braking can't happen if there's no train o
269.
by zkms 9y ago
Yanez fucked up, hard. He was clearly on edge and nervous from the start, put himself in a bad position, and the verbal commands he gave were utterly atrocious . He asked for proof of insurance and ID, and then once Mr. Castile informed hi
270.
by zkms 9y ago
It helps if you throw around phrases like "based on my training and experience" but yes, there's plenty of judges who act like literal rubber stamps when it comes to warrants. This is why "due process" doesn't

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