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  1. The first thing I'd suggest is making sure the...

    The first thing I'd suggest is making sure the Drive(s) RPM's are 300 RPM. There are RPM
    Programs that will test that. If the RPM's are correct, then I'd suggest checking the Manufacture's...
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    No, the Square wave should decrease in frequency...

    No, the Square wave should decrease in frequency by 1/2 as the Address lines increase in value A{0..15}.

    It would be interesting to remove the three ROM IC's and see if you get the same results. ...
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    The Address and Data Bus are the ones he was...

    The Address and Data Bus are the ones he was referencing. The Address Bus is 16 Bits {0..15} wide
    and the Data Bus is 8 Bits {0..7}.

    The Address Bus is always Output from the CPU to some...
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    You can use a Wooden Pencil inserted into the 180...

    You can use a Wooden Pencil inserted into the 180 degree bend to easily grip and
    remove or insert the Flex cable to isolate the RS-232 Board. Then you only have a couple
    more IC's to check for the...
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    Check the following areas of the schematics. ...

    Check the following areas of the schematics.

    Send me a PM if you can't locate the schematics.

    Larry

    64750647516475264753
  6. One other thing you might want to check is C9...

    One other thing you might want to check is C9 10,000 uF - 16 Volt Cap.
    They do go bad. I have a SPARE for my Model 1's.


    Larry
  7. Sure, The Original Power UP text is: R/S L2...

    Sure,
    The Original Power UP text is:


    R/S L2 Basic
    READY
    >_


    Your last two characters are 6W
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    If you look at the possible Graphics characters...

    If you look at the possible Graphics characters that the Model 1 can display, you can narrow down the
    Graphics Character as one of about three. 149, 161, 165, 170. Of these I think it is 149...
  9. Mick, What is the Make and Model of the Floppy...

    Mick,
    What is the Make and Model of the Floppy Drive you need a door for? There are several parts for floppy
    Drives on Thing-I-Verse. You can search Thing-I-Verse for the Manufacture and see if...
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    With Power OFF, depress the BREAK KEY, and keep...

    With Power OFF, depress the BREAK KEY, and keep it depressed. Turn on Power.
    When you see characgters on the Display release the BREAK KEY, and Depress the ENTER KEY
    three times. Then type in ...
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    It might be a TM-50. See if these Photo's...

    It might be a TM-50.

    See if these Photo's match.


    Larry

    64595
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    There used to be a good product named "No Noise"...

    There used to be a good product named "No Noise" that was used on Pots and it was Very Good.
    I've got a can with a few drops remaining. Hasn't been produced in probably 25-30 years.

    Larry
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    The Video Board is powered from the Astec Power...

    The Video Board is powered from the Astec Power Supply but, it also creates additional voltages.

    The Contrast and Brightness are 500 and 500K OHM pots.

    Larry


    64586
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    Nathan, Start with the Power Supply(s). If you...

    Nathan,
    Start with the Power Supply(s). If you have a Tandy Supply with a row of Pins for the connector, remove
    the supply and check each pin with a magnifying glass, looking for circles around...
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    Alan, So, of the 1/2 that you have floppy's you...

    Alan,
    So, of the 1/2 that you have floppy's you have evaluated, the SuperCard Pro could be used to
    ARCHIVE those if you sort them into stacks of Commercially Produced (INDEXED Mode) or User...
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    Alan, I did a bit of looking at the Supercard...

    Alan,
    I did a bit of looking at the Supercard Pro USB card. It will copy Commodore and C-64 Floppy's.
    You can read more under the FORUM TAB. You have to Sign IN to get to the Commodore Forum....
  17. Alan, One more point that I found with my bad...

    Alan,
    One more point that I found with my bad TRS-80 Model 1 Floppy's. The jacket's interior lining
    is part of the cause itself. Those come with some type material that lets the cookie turn...
  18. Kryoflux is the most expensive option for...

    Kryoflux is the most expensive option for archival. There is also the Supercard Pro $99.00,
    Greaseweazle, and Fluxengine. All these software packages deal with Flux transitions.
    I've also got a...
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    Yes, but i think if you compare the Pinout of U69...

    Yes, but i think if you compare the Pinout of U69 you will see that your EPROM
    reader's is different, and that is why it appears incorrect.

    Your U68 is an 8K x 8 ROM.



    U68
    ...
  20. Well, they both are sort of a last resort of...

    Well, they both are sort of a last resort of getting good data off questionable media. The fix is fresh media
    that is not 10+ years old. Not so easy to get your hands on these days. A GOTEK with...
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    Alan, Sorry, I have no clue what the half step...

    Alan,
    Sorry, I have no clue what the half step does. I just worked on problem ones or dead ones.
    I wasn't a user of any kind. I could get Ghostbusters to run for a bit to test loading.

    Larry
  22. As old as they are it's likely they will all...

    As old as they are it's likely they will all deposit the oxide on your read head(s). You can try Chuck(G)'s method
    of using a lubricant on the Floppy's. He also states to take the cookie out and...
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    Check out: Zimmers.Net by Bo Zimmerman ...

    Check out:

    Zimmers.Net by Bo Zimmerman


    One other thing you might find interesting is about the Commodore 6502 MOS IC's. I've replaced
    a 6502 in the 1541 Drive with an off the shelf 6502. ...
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    There may be a typo or two that I've missed, but...

    There may be a typo or two that I've missed, but I've been through the code more than twice.
    You will know when you try to execute it in basic.



    *******************
    PROGRAM: ALIGN 1541...
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    Sounds like you need a head alignment for the...

    Sounds like you need a head alignment for the Drive. Those 1541's banged the head a lot to locate where they were.
    That caused the drive to get out of alignment. I used to use a Cardinal Alignment...
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