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Joined 1 year ago
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Cake day: June 16th, 2023

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  • I’ve been using a Baratza Vario for over a decade and it’s great.

    On a support note the gear that connects the motor to the belt finally wore out. All the teeth were worn smooth. I ordered a replacement and when it arrived it had a different connection style and wouldn’t fit on the motor.

    I emailed and asked if they had an old one that would work with my motor. The didn’t but sent new a new motor for free. Machine is up and running again like a champ.


  • For ntsc vhs players it wasnt a component in the vcr that was made for copy protection. They would add garbled color burst signals. This would desync the automatic color burst sync system on the vcr.

    CRT TVs didn’t need this component but some fancy tvs would also have the same problem with macrovission.

    The color burst system was actually a pretty cool invention from the time broadcast started to add color. They needed to be able stay compatible with existing black and white tv.

    The solution was to not change the black and white image being sent but add the color offset information on a higher frequency and color TVs would combine the signals.

    This was easy for CRT as the electron beam would sweep across the screen changing intensity as it hit each black and white pixel.

    To display color each black and white pixel was a RGB triangle of pixels. So you would add small offset to the beam up or down to make it more or less green and left or right to adjust the red and blue.

    Those adjustment knobs on old tvs were in part you manually targeting the beam adjustment to hit the pixels just right.

    VCRs didn’t usually have these adjustments so they needed a auto system to keep the color synced in the recording.




  • Pretty specific use case. A normal OS handleds time slicing and core assignment for processes and uses it’s judgement for that. So at any time your process can be suspended and you don’t know when you get your next time slice.

    Same with when you make wait calls. You might say wait 100ms but it may be much longer before your process gets to run again.

    In a real time OS if you have real time priority the OS will suspend anything else including it self to give you the time you request. It also won’t suspend you no matter how long you use the core.

    So if you need to control a process with extreme precision like a chemical manufacturing process, medical device, or flying a rocket where being 10ms late means failure they are required.

    However with great power comes great responsibility. You need to make sure your code calls sleep frequently enough that other tasks have time to run. Including things like file io or the gui.








  • Years ago there was a commit to the Linux kernal that strangly had no author. This got some attention of several of the developers.

    Looking into the code that had to deal with network transmission. there was a section that if you tried to get network access in a unusual way had a check that was written something like this.

    If (usr_permission = ROOT) … Instead of If (usr_permission == ROOT) …

    The first giving the user root if invoked and the second checking to see if the user was root.

    It’s widely thought this was the NSA or some other intelligence agency trying to backdoor lin Linux.





  • If you are trying to steel credentials from people with power and money passengers in first class are a good target.

    Where else are you going to find a cluster of people like that that are using the wifi and are going to be there for hours. It’s about as optimal as I can think of.

    Even better if you are targeting a spefic company. Just pick flights out of the headquarters for that company.

    If you want to attack say Microsoft pick a flight from Seattle to DC. Pretty good odds of a Microsoft high up being on the flight and wanting to use the wifi for work.




  • When I was getting my engineering degree in the senior year we had some question and answer sessions with people from industry. The guy in class who thought he was way smarter than he was asked about going directly into an MBA program after graduation.

    The industry guy said it was a terrible idea. Your engineering knowledge would be 2 years out of date and who knows if you would be a good manager. He said to get a job and get some experience. If you show promise as a leader a good company will offer to put you through a MBA program and you well have the real world experience to make the best of it.

    So I think there is a real use for an MBA degree but only after some real world experience in your field and showing basic team leadership. People who go straight for an MBA tend to be the those who just want to boss people around and can’t handle real work.