topspin

4 ms·

1.
by topspin 7d ago
The goalpost in a on a trailer, cruising on the highway.
2.
by topspin 7d ago
GE9X aircraft engines have 3D printed low pressure turbine blades, so I think the view that jets are somehow exceptional is already disproven. There are real benefits to using additive processes for turbojet/fan applications: many jet
3.
by topspin 7d ago
Yes, that's the usual way. With SpaceX, however, Raptor engines are gimbled with electric actuators. And yes, the TVC adds very little to the complexity of Raptor 3's appearance: it still looks like science fiction, even when ope
4.
by topspin 8d ago
It depends. This product is pretty niche, and when a ~$3 MCU gives you the headroom you need without a team of career engineers on the payroll, it can make sense. Also, it's running USB power as opposed to batteries.
5.
by topspin 8d ago
MCUs are getting crazy. ESP32-S31 running Linux. 40MSPS/12b ADC+DSP on dsPIC33A. New Renesas parts running a 1GHz. RP2350 roflstomping things with PIO. The Cortex M7 in this story is actually pretty old now: circa 2019. Fun times.
6.
by topspin 11d ago
> Being the first country to put weapons in space The distinction of first (known) deployments of orbital kinetic weapons belongs to the Soviet Union. In 1968, they tested an anti-satellite system by intercepting a target satellite with
7.
by topspin 15d ago
> except the high priests of the LLMs / nascent Cthulhoid godlings Let's not be this flippant about where the real pressure for this is coming from. Presidents and their appointees come and go. The people pushing the regulato
8.
by topspin 15d ago
mmap(2) in Unix predates Linux itself by several years (1988 Sun, 1990 BSD). mmap(2) was present in Linux well before any of the high performance databases, file systems and other applications that use(d) O_DIRECT appeared on Linux. O_DIRE
9.
by topspin 18d ago
It's more about frequency than priority. When something has to be serviced tens of thousands of times a second, "a dozen or so" becomes a problem. If you have the silicon that solves this, you can retain the model. If you
10.
by topspin 21d ago
SpaceX has >11,000 satellites whipping around the planet. They increased the number of LEO sats by nearly one order of magnitude in bit more than 5 years. So apparently, in the US, the culture, expertise and infrastructure do exist to d
11.
by topspin 23d ago
Whatever OS/applications you have run in low priority ISR contexts, taking however much time they wish. When a high priority interrupt happens, the lower priority ISR contexts are preempted and then resumed after the high priority ISR
12.
by topspin 23d ago
> On more complex systems there is a pretty good chance you will end up with locked up hardware if your ISR is long enough. That is true of all such systems, from MCUs to the greatest CPUs ever made, and all prevailing software stacks ru
13.
by topspin 24d ago
I am aware. That "dozen or so" is a problem: when everything is an interrupt, there are no interrupts: it's just scheduling, and things that must be scheduled frequently can't suffer "a dozen or so" overhead.
14.
by topspin 24d ago
> The best case latency is higher than doing the work at interrupt level One approach is to do everything in ISRs, a la RTIC. That requires efficient, vectored, nested, tail-chained, base priority-ed interrupt silicon, and a lot of it,
15.
by topspin 24d ago
> How does one convince business leaders to bring it back? There are precisely 1.0 ways to do that: make all of the alternatives more expensive. That's it. Nothing else will move the needle. I don't believe it is possible: eve
16.
by topspin 24d ago
> I believe the math says the I6 is smoother than the boxer 6 Both designs (I6 and boxer) can have perfect primary and secondary balance. An I6 should be a smooth ICE, but there are other sources of vibration in these systems beyond inh
17.
by topspin 24d ago
The fastest reciprocating ICEs I've ever heard of are small, two stroke model engines. Some of those can approach 30K RPM, but that is rare, and I don't know if anyone still manufactures those. ~20K isn't rare for these sma
18.
by topspin 24d ago
A rifle round fired at 3000 feet per second from a 1:7 twist barrel turns a bit more than 300,000 RPM.
19.
by topspin 25d ago
Brave does what it says on the tin: It's another Blink based browser that is now rather mature and trouble free. It's supported by very responsive developers that provide a fully integrated ad blocking engine that is superior t
20.
by topspin 26d ago
"it was assumed if you kept up with updates and patches your risk would be low" I don't share that view at all. Updates and patches handled known risks. Updates and patches are often years late: side channel vulnerabilities
21.
by topspin 28d ago
The better question is: what is the net gain for the overall system? If PIM reduces the net thermal load and power consumption of the system for the same workload, then it’s a win regardless of where the heat sinks end up. The customers Sam
22.
Nancy Grace Roman Space Telescope Launches this Sunday(npr.org)
64 points by topspin 29d ago|2 comments
23.
by topspin 1mo ago
> Absolutely yes That's pretty strong. Recalling our pre-AI condition, there were side-channels built into our silicon, zero-day/zero-click browser+mail+IM attacks, supply chain attacks, industrial scale ransoming, mass creden
24.
by topspin 1mo ago
> assume nothing is safe anymore When was it ever possible to assume safety?
25.
by topspin 1mo ago
> the US is geographically huge and more sprawled out. There is ample historical evidence that this is a poor excuse. Long ago, leaders in the US understood the value of universality. You'll likely recognize this as the Network Eff
26.
by topspin 1mo ago
> How would I break through, if not ads? Make YouTube videos. Food porn is a thing, and some subset of that crowd will want to watch you fry stuff with your "pro" fryer.
27.
by topspin 1mo ago
"but say goodbye to castelated modules hand soldering is going to be harder" Yes, the package will be less friendly to DIY assembly. The greater number of GPIO are definitely welcome however: it's a high feature device and t
28.
by topspin 1mo ago
Beautiful. I read the "They Should Have Known Better" article and forgot it. I've seen this before. I know it's hot air and does not matter, and I can't afford to worry about things that don't matter. When I
29.
by topspin 1mo ago
> Geoblocking, fail2ban I use both on one port 22 host. Not much actually touches the server: maybe 5 hosts a day get banned. Meanwhile, China and the Netherlands are forever getting blocked and logged by geoblocking. I check the 24h lo
30.
by topspin 1mo ago
I've noticed that RealVNC has hidden their formerly free VNC desktop client, now called RealVNC Classic Viewer, behind an enterprise subscription login, and replaced it with a different cloud first thing, RealVNC Connect Viewer, that r

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