4 ms·

For ICBM test warheads they have a system that replaces the nuclear pit with a sensor package that measures the incoming shockfront, does signal processing and

For ICBM test warheads they have a system that replaces the nuclear pit with a sensor package that measures the incoming shockfront, does signal processing and gets out a radio signal before the entire thing is crushed.

whalesalad 3y ago
it’s giving UDP energy
sdfghswe 3y ago
Does this have a name? A keyword I could search for? A wikipedia page?
- the8472 3y ago
  High Explosive Radio Telemetry
- barryp 3y ago
  Try "The Computer Designed To Die In Microseconds" https://www.youtube.com/watch?v=FYdAT0v4DHs https://www.youtube.com/watch?v=FYdAT0v4DHs (Scott Manley) https://www.lanl.gov/orgs/padwp/pdfs/2nwj2-03.pdf https://www.lanl.gov/orgs/padwp/pdfs/2nwj2-03.pdf
MichaelZuo 3y ago
So if folks truly cared, it's possible to design a computer system to boot up, in a barebones fashion, and then do meaningful work and then transmit it, in under a millisecond?
- sudobash1 3y ago
  Certainly, and I imagine that there are plenty that we interact with on a regular basis. For example, door security sensors (like for Ring) will be off nearly all the time. When someone opens the door, they will power up, send a notification, and go dormant again. I don't know if this will happen within a single millisecond, but it certainly could if there was a design need. For many simple embedded systems that plug into the wall, the "boot" process will happen in under a millisecond. But it will take considerably longer than that for the voltage levels to stabilize. The real thing which differentiates these from a PC or phone is that they are not running what we would typically call an OS. They may be running an RTOS (a very simplified OS), but for many of them, as soon as they have stable power, they are off to the races (Just like the home-computers of the 80s. Just plug in and go.)
- dehrmann 3y ago
  I see you've never worked with microcontrollers.
  - MichaelZuo 3y ago
    Okay then link a microcontroller that can do that in under 1 milisecond?
    - 6502guy 3y ago
      A 6502 takes 7 cycles to execute the reset vector and run user code. Of course the definition of "usable" work can be argued over but even a C64 released in the 80s will run your code in less then 10us 1ms is an enormous amount of time. I'm really curious why you would think otherwise
      - MichaelZuo 3y ago
        Because I understand electronics just enough to know that sending a usable signal in under a millisecond from cold is incredibly tough. That's barely enough time for voltages to stabilize in even quite high end systems. Like I said link a microcontroller that can meet that. 'Usable work' can be as little as adding two half-precision floating point numbers together, and sending it can be any possible method.

whalesalad 3y ago

it’s giving UDP energy

sdfghswe 3y ago

Does this have a name? A keyword I could search for? A wikipedia page?

the8472 3y ago
High Explosive Radio Telemetry
barryp 3y ago
Try "The Computer Designed To Die In Microseconds" https://www.youtube.com/watch?v=FYdAT0v4DHs https://www.youtube.com/watch?v=FYdAT0v4DHs (Scott Manley) https://www.lanl.gov/orgs/padwp/pdfs/2nwj2-03.pdf https://www.lanl.gov/orgs/padwp/pdfs/2nwj2-03.pdf

MichaelZuo 3y ago

So if folks truly cared, it's possible to design a computer system to boot up, in a barebones fashion, and then do meaningful work and then transmit it, in under a millisecond?

sudobash1 3y ago
Certainly, and I imagine that there are plenty that we interact with on a regular basis. For example, door security sensors (like for Ring) will be off nearly all the time. When someone opens the door, they will power up, send a notification, and go dormant again. I don't know if this will happen within a single millisecond, but it certainly could if there was a design need. For many simple embedded systems that plug into the wall, the "boot" process will happen in under a millisecond. But it will take considerably longer than that for the voltage levels to stabilize. The real thing which differentiates these from a PC or phone is that they are not running what we would typically call an OS. They may be running an RTOS (a very simplified OS), but for many of them, as soon as they have stable power, they are off to the races (Just like the home-computers of the 80s. Just plug in and go.)
dehrmann 3y ago
I see you've never worked with microcontrollers.
- MichaelZuo 3y ago
  Okay then link a microcontroller that can do that in under 1 milisecond?
  - 6502guy 3y ago
    A 6502 takes 7 cycles to execute the reset vector and run user code. Of course the definition of "usable" work can be argued over but even a C64 released in the 80s will run your code in less then 10us 1ms is an enormous amount of time. I'm really curious why you would think otherwise
    - MichaelZuo 3y ago
      Because I understand electronics just enough to know that sending a usable signal in under a millisecond from cold is incredibly tough. That's barely enough time for voltages to stabilize in even quite high end systems. Like I said link a microcontroller that can meet that. 'Usable work' can be as little as adding two half-precision floating point numbers together, and sending it can be any possible method.