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Thread: Jumper setting of 5.25" Teak FD-55GFR 149U for FC5025 USB 5 1/4" floppy adaptor pcb

  1. #1
    Join Date
    Feb 2014
    Melbourne, Australia
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    Lightbulb Jumper setting of 5.25" Teak FD-55GFR 149U for FC5025 USB 5 1/4" floppy adaptor pcb

    Hi all,

    I am trying to set up a Teac 5 1/4" floppy drive to a FC5025 USB 5 1/4" floppy adaptor pcb made by

    So far looking at the uTube videos about FC5025 pcb and 5.25" boards and deviceside's web info I cannot see any into on setting jumpers for the Floppy being used.

    Maybe I am missing something?

    After much searching I found the following and am reproducing it here as original poster mentioned that it be archived.

    I found the following Teac FD-55GFR jumper data was posted in Sept 1996

    ""I got the data from TEAC's data storage product agent in Sydney,
    Australia, They sent me faxed pages out of what looks like the
    manufacturer's technical service manual for these drives.

    This data refers only to the FD-55GFR-149U. There is also a -140 which
    looks the same and has the same layout. Perhaps it is basically the
    same drive and this data applies to that one as well.

    D0, D1, D2, D3 These give the drive address in a daisy chain configuration.

    U0, U1 Used to select turn-on condition of front bezel light (see below).

    IU Jumper to make the signal interface terminal 4 be used for the IN-USE input signal
    When strap is removed, the input circuit is open and the IN-USE signal ineffective.

    ML Selects spindle action according to host command. When open, spindle rotates only by MOTOR ON input signal.
    When jumper is ON motor rotates when (a) MOTOR ON input signal is TRUE (b) front bezel indicator turns on.

    RY/DC Used to select function of READY/DISK CHANGE signal on terminal 34.
    When RY jumper ON signal on terminal 34 functions as ready signal, and it functions as DISK CHANGE
    signal when the DC jumper is ON.

    LG Used to select meaning of HIGH/NORMAL DENSITY input signal. When on, LOW level of HIGH/NORMAL DENSITY
    signals. When on, LOW level of HIGH/NORMAL DENSITY signals high density mode. When off, LOW level of
    HIGH/NORMAL DENSITY signal designates normal density mode.

    I and IS Used to select speed of drive. I strap on: dual speed mode designated.
    (360 rpm High Density, 300 rpm Low Density).
    Ready state reset once synchronising with a level change of
    the HIGH/NORMAL DENSITY signal. Both I and IS OFF, single
    speed mode designated. Speed is 360 rpm regardless of
    HIGH/NORMAL DENSITY signal. Both I and IS on, dual speed
    mode is activated but FDD remains in ready state, regardless of
    level change of HIGH/NORMAL DENSITY signal.

    E2 Selects output condition of INDEX and READ DATA pulses.When OFF pulses are ouput as in (DIAGRAM NOT
    SUPPLIED). When ON, outpup conditions changed to logical expression as follows:

    INDEX: Index hole detection *
    DRIVE SELECT * Ready state
    READ DATA: Read data detection *
    DRIVE SELECT * Ready State

    * Write operation

    FG Connects FDD frame to DC 0V.

    Front Bezel Indicator

    Selection Jumper Combo. Indicator turn-on condition
    1 * * * Drive select
    2 IU * U1 Drive select + in-use
    3 IU U0 * In use
    4 * U0 U1 Drive select + ready
    5 IU U0 U1 In use + (drive select * ready)

    1 Indicator tuns on when DRIVE SELECT signal TRUE
    2 Indicator turns on while DRIVE SELECT signal is TRUE or IN USE signal TRUE
    3 Indicator on while IN USE signal TRUE
    4 Indicator on when DRIVE SELECT signal TRUE and FDD in read state.
    5 Indicator turns on, on conditions 3 or 4

    I do not what the default settings are meant to be.
    Mine are FG, D1and DC jumpered.

    On the 3COM web site they make a technical note about these drives (in
    document 0000526B) and say D0, I, RY and D3 should be jumpered. (No, I
    don't know the significance of jumpering *2* drive address selections.
    It does not seem logical.)

    Well, there it is folks. I hope after all that typing it is of use to
    *someone* and that somebody sticks it in an archive somewhere. Note
    that the words are not necessarily exactly as in the data. I have
    shortened and reworded the text where possible.

    David Maddison""

  2. #2
    Join Date
    Feb 2014
    Melbourne, Australia
    Blog Entries


    Hi all. I have had no feedback to this post question.

    So just putting this out again to all of you.

  3. #3
    Join Date
    Jan 2007
    Pacific Northwest, USA
    Blog Entries


    The problem is that I can't figure out what you're asking.

    Many of us have the original Teac jumper information shown here (h/t Deramp, but it looks exactly like mine).

    The "normal" IBM PC setup is DS1, single-speed with density select on pin 2. Disk change on pin 34.

    Whether or not the Deviceside (is it still being made?) uses that, I have no idea.

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