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Thread: Model I - Things to check before applying power?

  1. #21

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    Quote Originally Posted by troj View Post
    Thanks - I'm new to the EI, so this is a learning experience in many ways. While the first computer I learned to program on was a Model 1, it didn't have an EI, so that's new.

    If I hold down the break key when powering it on or resetting it, I get the memory prompt. Hitting enter and then typing "? MEM" I get 15572, which seems low.

    -Kevin
    You'll need to look in the EI and see if there's any memory installed.

  2. #22

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    Quote Originally Posted by Alphasite View Post
    You'll need to look in the EI and see if there's any memory installed.
    It does have 32K in it - both the model and there are chips installed (I had it opened earlier today).

    -Kevin

  3. #23
    Join Date
    Apr 2015
    Location
    Morisset, NSW Australia
    Posts
    232

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    There are several possibilities now. From your other thread I gather you still need to clean the edge connector? I would try that first. After that:

    * The connection (at either keyboard or EI end) could still be dodgy.
    * The cable could be dodgy - this could be either the buffer chips or the wires in the cable.
    * Your EI doesn't actually need a buffered cable
    * Your EI also needs the extra timing connector.
    * Memory is dead
    * Something else on EI board is dead
    * EI is, generally, borked.

    What is the model number of your EI? That will answer the points about needing/not needing a buffer or extra timing cable.

    Apart from that, I would try repeating the sequence:

    * Power down M1
    * Power down EI
    * Wait
    * (optionally) unplug and replug connector cable at both ends
    * Power up EI
    * Power up M1 with break key held
    * get to basic prompt and type "PRINT MEM"

    See if you get a much higher number along the way. That would scream dodgy connection/cable. After that you get to the last 3 where it gets waaaaaaay more fun.

    PJH

  4. #24

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    EI model number is 26-1142-1.

    I assume what you refer to as the "timing cable" is the cable with the DIN connector? Both the EI and the Model 1 have those.

    When I tried the "print mem" yesterday, I got 15572, but I will try it again later today.

    -Kevin

  5. #25

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    It's definitely not seeing the RAM in the EI.

    While reviewing this post I found that "print peek(16561)+peek(16562)*256" will display the top end of memory, 32K with no EI and 64K with a fully populated EI. I got 32767. Not good.

    Of course, I still need to get those edge connectors fully cleaned. I've got stuff on order that I'm hoping will get that resolved for me, and then I'll try again.

    -Kevin

  6. #26

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    Thanks to Jay, I now have a very nice OEM monitor to go with the Model 1. Works great and the case is in fantastic shape!

    I got my can of Deoxit, but haven't had a chance to work on the edge connectors, so no further progress on the EI yet.

    -Kevin

  7. #27

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    Continuing the story on the efforts to get this system up and running, today I had a chance to tackle the Expansion Interface. The edge connector on the Model 1 was very corroded and a pink eraser wasn't making a dent. I ordered a can of Deoxit and ended up using a yellow scotch brite pad (yellow is the least abrasive and the same I use to clean my smooth top range), followed by a pink eraser.

    After cleaning the connector in the Model 1 as well as the EI, I applied power. New results than what I've had before - it didn't get a garbled screen, and memory still only shows the base 32K (RAM + ROM). So, something is still amiss.

  8. #28
    Join Date
    Mar 2016
    Location
    Pikesville, Maryland
    Posts
    121

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    Quote Originally Posted by troj View Post
    Thanks to Jay, I now have a very nice OEM monitor to go with the Model 1. Works great and the case is in fantastic shape!

    I got my can of Deoxit, but haven't had a chance to work on the edge connectors, so no further progress on the EI yet.

    -Kevin
    Thank you for the mention !!!!

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