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Type: Posts; User: RobS

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  1. Replies
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    In the 1970s our company used Honeywell Keytape...

    In the 1970s our company used Honeywell Keytape machines, which were direct replacements for the earlier card punching machines but using standard half inch magnetic tape instead of cards. Card...
  2. Poll: Yes, for some of us this stuff may be history but...

    Yes, for some of us this stuff may be history but for us older contributors it has been our lives. As a young man I attended a Honeywell 200 programming training course in 1965 when the marketing...
  3. Poll: I think this poll has illustrated the diversity...

    I think this poll has illustrated the diversity of contributors to this forum. Personally I regard myself as being primarily neither a collector nor user but a replicator. Collecting and using...
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    I'm one for improvising solutions. When I saw in...

    I'm one for improvising solutions. When I saw in a garden centre adhesive copper strips for sticking around the stems of shrubs and trees to deter slugs I bought a pack and tried using them to patch...
  5. The list that I see is this. 57788 Do you...

    The list that I see is this.

    57788

    Do you see something different?
  6. I know that you can see the list by going to the...

    I know that you can see the list by going to the advanced editor and hitting "Manage attachments" near the bottom of the page. In the attachments popup window that appears the question mark icon in...
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    My wife bought me a flip-top mobile phone for my...

    My wife bought me a flip-top mobile phone for my birthday last year. It's my first mobile and I hardly ever use it. Her iPad has recently exhibited an annoying text correction quirk. When she writes...
  8. I just used the "Insert image" icon and let the...

    I just used the "Insert image" icon and let the editor do its thing. I don't know why it chose to omit the link the first time. The second time that I did the same thing it worked. I've no idea why.
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    Oh dear, I just noticed an error on my control...

    Oh dear, I just noticed an error on my control memory diagram. It shows sixteen bits in the main memory address register whereas there are only fifteen just as in the other registers. The type 201...
  10. My thanks also. However, reading back your own...

    My thanks also. However, reading back your own post to check that the attachment has worked correctly isn't a complete solution to avoiding problems as THIS POST shows. It looked okay when I read it...
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    I mentioned previously that I had to assemble...

    I mentioned previously that I had to assemble some replica boards for the main memory, so here is a picture of one of them next to an original to illustrate the lengths to which I am prepared to go...
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    57636 I don't know what went wrong there. Is...

    57636

    I don't know what went wrong there. Is this okay?

    I took a look at the emulator on your website, which is equally impressive. If only my project could be completed so quickly. Thanks for...
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    With the recent relaxation of limits on pictures...

    With the recent relaxation of limits on pictures here I can now post a diagram of my control memory logic map.

    57628

    The main components shown consist of 24 six inch square circuit boards...
  14. I agree that the current limits are a problem....

    I agree that the current limits are a problem. Only yesterday I was considering how to present a picture on the site and they preclude me from uploading it, but if I store it in my own website domain...
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    This is just a quick update on the project...

    This is just a quick update on the project although I haven't done any work on the electronics since my last post. Instead I've been focussing on providing a larger workspace and am currently...
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    Yes, there are certainly Honeywell components...

    Yes, there are certainly Honeywell components there and there are also address mode 2, 3 and 4 buttons, which means that it had a large character oriented CPU, so that points to that part being...
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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.
  21. Thread: Basic interpreter

    by RobS
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    2,402

    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...
  25. Thread: Basic interpreter

    by RobS
    Replies
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    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...
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