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Thread: Spindle won't run when 5.1/4 floppy Panasonic JU-475-3A11 is accessed

  1. #11
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    Jun 2015
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    Here is a complete list of jumper settings
    Attached Files Attached Files

  2. #12

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    Quote Originally Posted by rittwage View Post
    Has someone written a true disk wiping utility for DOS? I added one to nibtools years ago for C64 so I use that on 5.25" disks. Removes all flux transitions... no escaping that on any platform.
    How about a Neodymium magnet?
    PM me if you're looking for 3" or 5" floppy disks. EMail For everything else, Take Another Step

  3. #13
    Join Date
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    Chaffee, MO
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    Vic,
    You have made some progress. I'll send you a link to FMTMAS so you can try it. Lacking that, get a
    STRONG Magnet and run over the floppy sleeve to erase the "Cookie" as best you can over both sides.
    hat might get rid of the TRACK 0 - bad message. Or try a fresh floppy that hasn't been corrupted.
    If you had FMTMAS to format with, and if it said that the floppy was bad, I'd toss it in a BAD pile.
    But, save them until you can try FMTMAS, as I've had good luck with that software for formatting such floppy's.

    The reason I wanted the Voltage on Pin 2 of the Floppy Edge Connector was to VERIFY the DENSITY SELECT
    signal of the Floppy as 1.2M. REF: The floppy user guide by Michael Haardt, Alain Knaff, and David C. Niemi

    DENSEL
    selects double density or high density and at the same time if reduced write current should be used as
    those are coupled. For this reason, this pin is sometimes also called low current. [Level assignment
    is still unknown. It is said that the assignment is inverted between 5 1 ⁄ 4 " and 3 1 ⁄ 2 " floppies.] Modern
    ‘‘intelligent’’ 3 1 ⁄ 2 " HD drives do not depend on this signal but recognize the data rate from the floppy
    disk.
    From the 82077.pdf document (p.50 & p,51):
    Typically DENSEL is active high for high (500 Kbps/1 Mbps) data rates on 5.25 drives. And DENSEL is
    typically active low for high data rates on 3.5 drives.

    Here are some typical definitions for the Jumprs, depending on the actual Floppy Schematics.
    Notice that the first letter H is for HEAD, and D is the signal Drive Select controlling the Loading.

    Code:
    HD - Head loading controlled by the Drive Select signal
    HM - Head loading controlled by the Motor On signal
    RD - Ready signal enabled
    DC - Stores door closure
    WP - Write Protect signal enabled
    MM - Drive motor enabled by the Motor On signal
    MS - Drive motor enabled by the Drive Select signal
    UA - Front LED handled by the In Use signal
    DA - Front LED handled by the Drive Select signal
    RY - PC XT-AT compatibility
    TM - Terminator
    MX - Drive selected by the Drive Select signal
    DS - Drive selection enabled in a multidrive system
    SR - Ready is the output signal of interface pin 34
    MUX - Drive selected permanently
    DE - Motor set to 360 rpm
    DX - Motor rpm controlled by the Low Density signal
    DC - Disk Change is the output signal of interface pin 34
    FG - The drive ground connected to DC ground by means of capacitors and resistances
    UA - Front LED controlled by the Ready signal
    DA - Front LED controlled by the Drive Select signal
    OA - Front LED controlled by the Ready or Drive Select signal
    HA - Front LED controlled by the Ready and Drive Select signals
    MM - Motor drive enabled by the Motor On signal
    MB - Motor drive enabled by the Drive Select signal
    1M - Single Mode (only 1 MB)
    BX - Double speed
    IU - In Use
    MO - Spindle motor controlled by the Motor On signal
    MS - Spindle motor controlled by the Drive Select signal
    According to the posting of the Jumpers, you DO NEED OP Jumpered for Dual Mode.
    So, JUMPER OP.

    Send me an email, so I can get you a link to FMTMAS.

    Thanks.

    Larry
    Last edited by ldkraemer; December 12th, 2019 at 07:56 AM.

  4. #14
    Join Date
    Mar 2013
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    Chaffee, MO
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    Try these settings and see if you can format a 1.2M Floppy.

    Code:
    DS2 ON
    OP  ON
    DA  ON
    MM  ON
    MDA OFF - these keep Pin 34 LOW
    MDB ON - these keep Pin 34 LOW
    If it works for 1.2M Floppy, then try a 360K floppy.

    Thanks.

    Larry
    Last edited by ldkraemer; December 12th, 2019 at 08:51 AM. Reason: changed to MDB

  5. #15
    Join Date
    Mar 2012
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    Augusta, Georgia, USA
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    Quote Originally Posted by Stone View Post
    How about a Neodymium magnet?
    That is hit and miss. It's like trying to clean your glasses with a dirty napkin.

  6. #16
    Join Date
    Jan 2007
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    Pacific Northwest, USA
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    For disk erasure, see my posts on using a pair of magnets from a microwave oven magnetron. It works very well--just as well as my old-style VHS bulk eraser.


  7. #17
    Join Date
    Mar 2012
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    Augusta, Georgia, USA
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    https://www.facebook.com/photo.php?f...type=3&theater

    Sorry for Facebook link, but here is what magnets do to the disk. It does not really "erase" it.

  8. #18
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    I get a "page not found"

    Did you read my posts on the eraser? Said magnets are arranged with like poles facing. The effect is to "spread" the lines of flux. The effect isn't the same as unlike poles facing or even a single strong magnet--and I've tried some of the ones that are dangerous-strong.

    Audio tape recorders used PM erasure on lower priced models--basically two V-shaped faces.

  9. #19

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    Quote Originally Posted by Chuck(G) View Post
    I get a "page not found"
    Yup...
    PM me if you're looking for 3" or 5" floppy disks. EMail For everything else, Take Another Step

  10. #20
    Join Date
    Mar 2013
    Location
    Chaffee, MO
    Posts
    1,314

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    Chuck,
    If you login to Facebook, then the link works.

    Thanks.

    Larry

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