Zimmie

@bob_zim

Former firewall tech support. Now, senior infrastructure admin at a financial institution.

DFW, Texas
Vrijeme pridruživanja: studeni 2010.

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  1. 3. velj

    People used it, thinking it was the network, not some bogus single address. The configuration referencing that object didn’t work, because everybody thought it was the whole network, but it was really an invalid address. I feel dumber for having run into this issue. Goodness.

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  2. 3. velj

    Just ran into a deeply dumb issue caused by Systems Hungarian. Somebody meant to make an object to represent a network of computers. They instead made an object which represents *one* computer, but they named it “Network-10.20.30.0/24” with the IP 255.355.255.0.

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  3. 30. sij

    A friend was complaining about how many modern computers are single boards. Phones. Laptops. A lot of desktops. You can’t really build any of these on your own, but the things people *can* build are amazing! When I was growing up, logic analyzers were wildly impractical to own.

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  4. 30. sij

    Had a brief discussion the other day. People who want to get into electrical engineering and hardware hacking have never had it so good. High-quality instruments are cheaper than ever. FPGAs, DSPs, and microcontrollers are cheaper and more widely available than ever. It’s great!

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  5. 21. sij

    Running audio like this actually has some other benefits in very low-power situations. It helps reject noise (same reason network cables use twisted pairs of wires). There are also certain elegant amplifier designs which only work in this way. Balanced audio is very cool.

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  6. 21. sij

    Where it gets cool is when you hook up a speaker to the right channel + and the left channel -. This gives you twice the total difference between the lines as you could get when running two separate channels (+5v to -5v versus +5v to 0 and 0 to -5v), which means twice the power.

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  7. 21. sij

    To take advantage of this, the right channel runs normally, and the left channel amplifier is inverted. When the input voltage goes up, the output voltage goes down.

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  8. 21. sij

    This works because all electricity really cares about (for this situation) is the difference between the + and - wires. Putting + at 5 volts and - at ground is the same as putting + at ground and putting - at -5 volts.

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  9. 21. sij

    Coming back around to the amplifier thing, the short version of how it can run a single speaker with double power is it runs the two channels in opposite directions. On the right channel, the signal is on the + wire and ground is on -. Left, + is ground and signal is -.

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  10. 18. sij

    Probably traveling for work some time next month, so I’m spending the morning conditioning some leather. Duffel, shoulder strap, some luggage tags, and so on. I don’t really enjoy the process of conditioning leather (it’s pretty messy), but *wow* do I like the results.

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  11. 15. sij

    In my specific case, I have a lot of data which refers to other data using an identifier. Rather than making people deal with the identifiers, I build a sed script to replace them with some information about the object. That information could contain any printable character.

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  12. 15. sij

    Fortunately, ASCII includes a set of characters which don’t produce a printed glyph on the screen, but which are still characters as far as the computer is concerned! So by using one of those characters, I can deal with arbitrary human-entered data much more reliably.

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  13. 15. sij

    To see how this is useful, think of a CSV which contains human-entered data in the fields. People use commas. For example, a name can be represented as “Last, First”. Wouldn’t it be great to have a character to separate the fields which is extremely unlikely to be in the data?

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  14. 15. sij

    I confirmed today that sed accepts non-printing characters as delimiters within the script! That’s awfully convenient for machine-generated scripts.

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  15. 8. sij

    Coming from a family with a lot of spooks, I’m about 80% sure FBI *leadership* does not understand encryption. They just think of it as a physical lock keeping them from seeing what they want.

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  16. 6. sij

    I just realized the gif pronunciation arguments bug me in the same way as saying “Maria is the Spanish translation of Mary”. Names don’t translate, because they don’t mean a concept, then mean an exact thing. They are also pronounced how the person who gave the name says.

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  17. 6. sij

    As an aside, check out how two speakers connect. This amplifier also supports running a single speaker with twice the power. Who sees how? The answer is a neat fundamental aspect of electrical engineering which a disappointingly large number of people forget.

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  18. 6. sij

    Unrelated to keyboards, I just found out the fuse holder for some of my speakers is directly compatible with the fuse holder for one of my amplifiers from a totally different company. That’s awfully convenient! Now if only the amp had output terminals which didn’t suck.

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  19. 6. sij

    To be clear, I absolutely understand not spending your own money on a keyboard for work. The company should buy that, and most companies’ purchasing processes are deeply broken. It sucks that there isn’t really a good solution to this for most people.

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  20. 6. sij

    It’s wild how many people use cheap keyboards on their computers, either at work or personal. Enormously better keyboards generally only cost $50-100. That’s less than most people spend on their processor, RAM, or storage, and a good keyboard lasts through several computers.

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