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  1. Replies
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    The machine isn't particularly interesting...

    The machine isn't particularly interesting visually yet, so far just being dozens of six inch square logic boards plugged into a backplane. Also there are very few boards on the backplane currently...
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    I tested the switching speed by chaining six...

    I tested the switching speed by chaining six gates in series to get an overall delay that was easy to measure and this test yielded on average 20nS per gate with Honeywell's commonly used 33pF...
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    Under my self-imposed regime I can only use the...

    Under my self-imposed regime I can only use the technology that I have in the boards that I salvaged or others that I find in the future and in over a thousand boards there were no power ICs at all,...
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    Thanks for the info on the internals of the...

    Thanks for the info on the internals of the S-993A. They confirm my own view that it's the real deal soundly made and it's just a question of how long it will last.
  5. Thread: Basic interpreter

    by RobS
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    In fact I would say that it's essential that one...

    In fact I would say that it's essential that one does.


    In the days of eight bit processors I think the 6809 was the favourite for running Forth because it could do indexed addressing which...
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    Actually after forty to fifty years the phenol...

    Actually after forty to fifty years the phenol has pretty much dried out, so it's not a problem, even with my crates containing over a thousand boards.
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    Chuck: Thanks for your remarks, but they aren't...

    Chuck: Thanks for your remarks, but they aren't really applicable to my situation.

    For my machine to be regarded as being in the style of the 1960s Honeywell 200 range, even if it is only a...
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    It looks like the Teensy 3 is intended to operate...

    It looks like the Teensy 3 is intended to operate on 3.3 volt signals and my logic needs the full 5 volts where the Arduino is acting as a current source, not sink, so I'd need to provide some...
  9. Thread: Basic interpreter

    by RobS
    Replies
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    1,225

    My first complete computer was a Sharp MZ80A with...

    My first complete computer was a Sharp MZ80A with 48k bytes of memory. I had played with microprocessors when they came out years before though. Despite having plenty of memory by the standards of...
  10. Thread: Vintage years.

    by RobS
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    It's funny that you should mention that. One of...

    It's funny that you should mention that. One of my responsibilities during Y2K was to work with a member of the company's accounts department on replacing our cheque processing facility. As we still...
  11. Thread: Vintage years.

    by RobS
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    I also worked on Y2K at my company and I think I...

    I also worked on Y2K at my company and I think I was the only person to discover a Y2K problem in a software package supplied by an outside company that claimed that it was compliant. I was actually...
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    Connecting logic outputs in parallel

    In my Honeywell 200 replica project I have a problem that might need my design to sail close to the wind. I am using original Honeywell logic ICs from the 1960s that are probably DTL and the maximum...
  13. Thread: Wire wrap

    by RobS
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    Ah yes, I see. I use the original Honeywell 200...

    Ah yes, I see. I use the original Honeywell 200 pin identifiers, so A3J-22 is zone A column 3 row J block 2 pin 2. It’s actually a very easy way to find a specific pin on the backplane.



    All...
  14. Thread: Wire wrap

    by RobS
    Replies
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    4,305

    Thanks for that. In the creative writing forum to...

    Thanks for that. In the creative writing forum to which I regularly subscribe I have awards for over a thousand LOLs and over a thousand Likes and if they had an award for being long-winded a...
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    Well, why should I worry? Mine is officially...

    Well, why should I worry? Mine is officially rated for 220 volts operation, but the UK supply is 230 volts +10% -6%, and often 240 volts in practice, so the device is likely to usually be used at 10%...
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    Okay, here’s a quick progress report as I need to...

    Okay, here’s a quick progress report as I need to get ready for our Sunday lunch soon. (Waistcoat and tie of course, full English roast with wine, candelabra and linen napkins, even a tablecloth!...
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    Maybe it's a problem specific to the UK on this...

    Maybe it's a problem specific to the UK on this site then Dave. That's ironic given that we're just celebrating the thirtieth anniversary of the conception of the World Wide Web, as opposed to the...
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    By the way, looking closely at the picture on...

    By the way, looking closely at the picture on that Amazon page, the S-993A depicted does have the Gaojie label on it the same as mine, so I don't know who YaeCCC are. Maybe they do the 110 volt...
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    I don't think the problem is the editor itself...

    I don't think the problem is the editor itself but the fact that the site seems to think that I'm inactive while I'm typing on it, so logs me out. I can overcome the problem by requesting a preview...
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    I bought an S-993A made by Gaojie a few weeks ago...

    I bought an S-993A made by Gaojie a few weeks ago and have tried it out on a few ICs on a PCB with plated through holes. It does the business okay with no damage to the IC or board but it looks like...
  21. Thread: Wire wrap

    by RobS
    Replies
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    Damn! While I was typing my response the site...

    Damn! While I was typing my response the site logged me out and then hung when I logged back in, so I lost all my text permanently with no autosave. I'm just not used to using such a hostile...
  22. Thread: Wire wrap

    by RobS
    Replies
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    4,305

    I included A3J-22 in this example just to...

    I included A3J-22 in this example just to illustrate what happens when one needs to make a change later. My project is really a very elaborate prototype which I develop and test in stages, so there...
  23. Thread: Wire wrap

    by RobS
    Replies
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    The easiest way for me to explain the daisy-chain...

    The easiest way for me to explain the daisy-chain problem is to show virtual examples using my wirewrap documentation application. The real examples are deep in the rat’s nest on my backplane and not...
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    Back as promised. However, I am having serious...

    Back as promised. However, I am having serious trouble with this website and have just irretrievably lost the substantial post that I typed, so will now go away and fume before coming back to try...
  25. Thread: Wire wrap

    by RobS
    Replies
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    4,305

    They sound more like a bed of nails than even my...

    They sound more like a bed of nails than even my backplanes and as the pins on those do have bevelled ends I have to use a mat to protect my hand when it is up against them while working or else it...
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