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Type: Posts; User: Dwight Elvey

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  1. I'm curious as to the processor in the older...

    I'm curious as to the processor in the older machine? The newer one is likely a 8088 or maybe a 8086.
    The older one might be a Z80. Some times these small companies use standard operating systems....
  2. Although for speed running a defrag is useful on...

    Although for speed running a defrag is useful on a fat setup. If there is any problem with the fat, defrag can make a real mess.
    PCOS ( for the M20 ) had a separate command to free up small pieces...
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    I know there is a temptation to replace all the...

    I know there is a temptation to replace all the sockets. Don't do it until you have it working. If there is a problem with this one socket, replace it but do it with intent to fix a particular...
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    Seeing the resistance is better than a beep....

    Seeing the resistance is better than a beep. measure between the lead of C7 and some other component as found on the schematic. The resistance should about the same as the two leads connected. You...
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    I expect you to look at the schematic and trace...

    I expect you to look at the schematic and trace where each pin should be connected to. You then use an ohm meter to insure it is connected.
    Dwight
  6. A registered PAL or GAL would be a one chip...

    A registered PAL or GAL would be a one chip solution.
    Dwight
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    It is also possible that there is a socket broken...

    It is also possible that there is a socket broken and the 6520 didn't get initialized properly. The interrupt output has to be setup at the beginning of the code.
    Make sure all the data lines,...
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    Others have had this same problem and we have...

    Others have had this same problem and we have found that leaving the shutter open for several display cycles is better than the shorter 60Hz shutter. If there is no 60Hz mode, extending the stutter...
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    If the reader loads at 0, the BASIC is likely...

    If the reader loads at 0, the BASIC is likely some place else. How do you load the BASIC without the loader?
    Dwight
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    Most camera will extend the shutter time if you...

    Most camera will extend the shutter time if you just dim the background lighting.
    Dwight
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    That is what they are for then. The one that was...

    That is what they are for then. The one that was shown had no wires and likely had no door switch.
    It is clear that it is for a door switch and not a test point, as I suggested.
    Dwight
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    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...
  13. 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...
  15. 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...
  21. 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...
  24. 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...
  25. 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...
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