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Type: Posts; User: Dwight Elvey

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  1. It looks to only have one pin in the connector....

    It looks to only have one pin in the connector. I'd say it wasn't a jumper but a location to connect a test cable. Since it is on the motor control board, I would suspect it is used to look at the...
  2. I'm always looking for one of the LEDs in the...

    I'm always looking for one of the LEDs in the gold body. I have one dim one on my SIM4-01 setup.
    Dwight
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    To kind of go along with Chucks mentions, they...

    To kind of go along with Chucks mentions, they even had pneumatic flip flops and gates based on the Bernoulli effects. One might think that it had some moving parts, similar to a automatic...
  4. Can we say LapLink? Dwight

    Can we say LapLink?
    Dwight
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    I'm trying to think of another word. Its use was...

    I'm trying to think of another word. Its use was clearly bad. It didn't really do what it was intended to do and that was to demoralize the British. It didn't do that, if anything it did just the...
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    Back to the original thread. I'm not sure how the...

    Back to the original thread. I'm not sure how the older Intel CPUs measured the temperature. They used to do what was called a corner temperature. This was an external sensor at the corner of the...
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    One of the annoying problems of analog computers...

    One of the annoying problems of analog computers is the two different types of offset. One can have input voltage offset and input current offset. They don't often happen at the same point. It is...
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    Most physical systems are often described as...

    Most physical systems are often described as differential equations. It is good to know how to translate differential equations to integral equations. Although, one can make differentiators with...
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    The most common thing to do with analog computers...

    The most common thing to do with analog computers is to integrate. This allows modeling of physical systems to see how they will respond in real life.
    While multiplying by a constant is easy with an...
  10. What I've done on one of my machines for a shadow...

    What I've done on one of my machines for a shadow ROM. When it boots, the reads are disabled on the RAM. Only the writes are not disabled. Which device that reads is controlled by a 7474 flop. There...
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    The basic 4040 is a Harvard architecture but like...

    The basic 4040 is a Harvard architecture but like the 8051, there are ways to connect the program and data portions. With the 4289, one can write to the program space using the 4040 and the 4389. The...
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    The 4004 and 4040 may not make much sense as the...

    The 4004 and 4040 may not make much sense as the typical uP. There were a number of specialize parts that went with these. The RAM wasn't like your typical 2102 It had specialized registers as well a...
  13. One wonders about the "pairing". Might it be to...

    One wonders about the "pairing". Might it be to automatically deal with known bad tracks? Most MFM controllers can easily reformat and partition disk drives. I guess for some people it is kind of...
  14. Run insulated solid single strand wire to a 2 AA...

    Run insulated solid single strand wire to a 2 AA battery pack and use alkaline batteries. Trace down the circuit on the positive lead. There will be a diode and a resistor. remove the resistor ( this...
  15. I should clarity. Smaller domains on the surface,...

    I should clarity. Smaller domains on the surface, improve bandwidth. It is not that the data frequency is changed but the timing accuracy of the edges are are improved. This is the same as improved...
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    It may not hold the data as long using a reduced...

    It may not hold the data as long using a reduced voltage. For quick experiments, you are likely fine. Do make sure you are NOT programming 2732A or 2732B with 25V.
    Dwight
  17. I believe that is what I said. Dwight

    I believe that is what I said.
    Dwight
  18. I'm sure you meant 74273. Dwight

    I'm sure you meant 74273.
    Dwight
  19. I almost did my self in as well. I was tuning the...

    I almost did my self in as well. I was tuning the first IF strip of a Racal tube receiver ( I loved that receiver. It had the sensitivity of the R390 without all the mechanical hardware to deal with...
  20. Color tv tubes can be damaged by a dead short to...

    Color tv tubes can be damaged by a dead short to the second anode. The mask is quite thin and easily bent by a sudden discharge. I've always used a 1 Meg resistor in series to limit the current....
  21. The danger has always been what you might do when...

    The danger has always been what you might do when zapped. Still, those with pace makers should always be a little more careful.
    Getting zapped and dropping a screw driver on the neck is not a good...
  22. A right shift was more important than a left...

    A right shift was more important than a left shift. One can always just add the same two numbers together to get a left shift. Being able to right shift by two bits was useful for doing square roots,...
  23. If the logic was created with latches, they would...

    If the logic was created with latches, they would have pos-edge and neg-edge clocked latches. You can not make functional logic with latches of all the same phase, unless you have no feedback....
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    Reading ROM chips with a EPROM programmer. Most...

    Reading ROM chips with a EPROM programmer.
    Most of these mask ROMs do part of the address decoding with the pins. Some of the EPROM programmers also leave the programming voltage on all the time....
  25. RLL drives have a little more band width than...

    RLL drives have a little more band width than non-RLL otherwise the are the same. The - numbers are usually newer revisions.
    AT drives have the controller built in and would be connected directly to...
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