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Type: Posts; User: Dwight Elvey

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  1. I would look at the drive. It is possible that...

    I would look at the drive. It is possible that your cleaning disk damaged the head's mounts. I never used cleaning disk.
    Dwight
  2. I've seen worse but this one is a classic. It...

    I've seen worse but this one is a classic.
    It did arrive with the box still around it.
    Dwight
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    I don't believe I've ever seen ceramic grey...

    I don't believe I've ever seen ceramic grey traces 4002-1s or -2s The closest I've seen are white ceramic with gold plated leads. They might have existed but I've never seen any.
    A web search shows...
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    Did you try different parity bits? Also, how...

    Did you try different parity bits? Also, how about stop bits?
    Dwight
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    Anchor Electronics has a 6520A. I believe it...

    Anchor Electronics has a 6520A. I believe it should be compatible. It is a lot cheaper than $400.
    Dwight
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    Something is generating an interrupt. Might be a...

    Something is generating an interrupt. Might be a 6520 or 6522.
    Dwight
  7. At least he put the glass side down( The right...

    At least he put the glass side down( The right thing to do. ). You still need to remove the yoke. Most have a hose clamp over an old aged piece of plastic. If it cracks, on the next bump, the yoke...
  8. http://www.gaby.de/ehome.htm for generic stuff....

    http://www.gaby.de/ehome.htm for generic stuff. N* specific stuff go to Mike's site.
    Dwight
  9. I do recommend repacking the CRT in a separate...

    I do recommend repacking the CRT in a separate box, not in the unit. You don't want the yoke attached either. Making a wood crate for the CRT is an option.
    Dwight
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    Of course one can buy it already done for you or...

    Of course one can buy it already done for you or just down load the code from gethub. That was not my point. The fun is in the journey, not the end result. It is also about the learning.
    Dwight
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    It might be better to just convert it to friction...

    It might be better to just convert it to friction feed.
    Dwight
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    If you like to tinker with embedded processors,...

    If you like to tinker with embedded processors, you can get an arduino or a blue pill and make a ps2 to which ever you output like. You need to dig up the ps2 protocol on the web and then make the...
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    He obviously think a digital scope it better. It...

    He obviously think a digital scope it better. It is different but not better, especially if you get one with a low sample rate. Like I said, look for one that specifies a large screen buffer. At...
  14. ARM isn't immune either. It is just that most are...

    ARM isn't immune either. It is just that most are embedded and don't run on the web where things can be loaded. Tablets can be, though. I've not looked into RISC-V, which likely has problems with...
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    As Dave says, you'll likely need an oscilloscope....

    As Dave says, you'll likely need an oscilloscope. It is just a fact of life. A lot can be done with a good logic probe but it is useful for the simpler error, of a stuck signal, not on a bus. The...
  16. As Mike says, both have to run some bad guys code...

    As Mike says, both have to run some bad guys code at the machine level. I could write a Meltdown code and give it to you to run but that is something you could just say you don't trust it and not run...
  17. It is not likely susceptible to Meltdown but most...

    It is not likely susceptible to Meltdown but most any Speculative processor is susceptible to Spectre, that has cache. Spectre does require help from some other code that runs at the privileged ...
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    Forth makes a great monitor. It is a little large...

    Forth makes a great monitor. It is a little large compared to most monitors but gives abilities that you are not likely to find in most monitors.
    Dwight
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    I've written a version of Forth ( I don't recall...

    I've written a version of Forth ( I don't recall which Forth I based it on ) to run on the 80C188 board. It was one that I originally wrote to be on a 80C186 board I got with GPS. I used it to log...
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    Oops, I forgot about that. Dwight

    Oops, I forgot about that.
    Dwight
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    If you find a connector pin that is bad,...

    If you find a connector pin that is bad, depending on the type, these can be replaced. If you have a donor connector, most will push out from the bottom. To put one back in is a little tricky. I put...
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    So, it is still the juicy ones or the tantalums....

    So, it is still the juicy ones or the tantalums. Not just all of the capacitors. I generally don't look at the others. The newer surface mount ceramics seem to fail a lot, almost as much as...
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    When you say this, do you mean drives that load...

    When you say this, do you mean drives that load down the power supply or drives that only don't work. Most capacitor failures that I've seen are on the power rails. I've seen a few else where but not...
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    Check your regulators under full load. I had a N*...

    Check your regulators under full load. I had a N* that with no load, the 12V line looked fine. Once I had both drive starting, the 12V line would drop and kill the DRAM. They'd used two regulators in...
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    I use a piece of tape, cut in a small strip, to...

    I use a piece of tape, cut in a small strip, to tack the chip down while soldering the ends. After soldered, I remove the strip. Use separate rosin flux so you don't have to depend on the solders...
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