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USB Syntax?

Discussion in 'Electronic Design' started by Jim Thompson, Jul 18, 2007.

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  1. Jim Thompson

    Jim Thompson Guest

    I want to switch a _USB_ mouse between multiple PC's.

    Anyone know any tricks to fake out the unconnected PC's so they think
    the mouse is there, but not sending data.

    (To avoid the new hardware pop-up.)

    ...Jim Thompson

  2. A new KVM with USB capabilities comes to mind. maybe something like


    Some other USB KVM here:


    Service to my country? Been there, Done that, and I've got my DD214 to
    prove it.
    Member of DAV #85.

    Michael A. Terrell
    Central Florida
  3. Joel Kolstad

    Joel Kolstad Guest

    If you're getting the "new hardware found" wizard pop-up after the first time
    you plug the mouse in, you've got one cheap mouse -- they didn't bother
    sticking an electronic serial number in each mouse, so Windows has no means of
    "tracking" the mouse between insertions (and doesn't even try to do it

    Anyway, I agree with Michael's suggestion -- a KVM switch is probably the
    easiest way to "fake out" the PCs into thinking they still always have mice
    connected. Ive have a couple of these: ... and they
    work well. Wal*Mart (at least around here) has them, so you could grab one in
    Phoenix and return it easily if it doesn't work for it.

  4. Clint Sharp

    Clint Sharp Guest

    If you connect the mouse to each PC and then subsequently use the same
    USB port does it still pop up the new hardware bubble? Not my experience
    with several machines here but I'm using a fairly generic MS Optical USB
    mouse so YMMV.
  5. Jim Thompson

    Jim Thompson Guest

    I have the IOGear GCS124U, a 4-port device.

    It works well with an old Logitech wireless mouse, but throws up on a
    new one :-(

    IOGear "support" is not helpful, says it's an "emulation" issue.

    ...Jim Thompson
  6. Joel Kolstad

    Joel Kolstad Guest

    What model is it? Not that I think this will help, really, I'm just curious.
  7. Jim Thompson

    Jim Thompson Guest

    Old mouse is Logitech LX-7, I think, no markings, and going on the
    basis of pictures on the website.

    New mouse V220

    Both are USB wireless.

    KVM is IOGear GCS124U

    IOGear tells me that a GCS104U will work, since it does not utilize
    "emulation", but it also doesn't have hot-key switching, got to press
    the button.

    I think IOGear is clueless about direct wire preventing hot-key
    control. I built a KV switch back in early DOS days for my son, who
    was managing a paging system at the time. I just captured keystrokes
    down a 74HC shift register chain, and did a broad-side match, and
    tossed those foreign to the PC before they got to it ;-)

    ...Jim Thompson
  8. Joerg

    Joerg Guest

    I bought an LX-something (no markings either) at Costco a few months
    ago, seen it again later and they may still have some. In case you just
    want to replace it. Works like a champ BTW.
  9. Ben Jackson

    Ben Jackson Guest

    USB is all mastered by the host. The host (or both, in this case)
    constantly interrogate the mouse to give it a chance to send back
    movement info. You could try just switching in the right sense resistors
    to claim the device is present, but when it stops responding things will
    probably go badly.

    Have you considered something like this:
  10. Jim Thompson

    Jim Thompson Guest

    I'm just about resigned to it, though I sure like these small
    "palmable" mice ;-)

    ...Jim Thompson
  11. Jim Thompson

    Jim Thompson Guest

    Interesting, might be worth hacking a KVM to switch based on running
    off the screen edge with the mouse.

    ...Jim Thompson
  12. Joerg

    Joerg Guest

    This LX-whatever I've got here is IMHO quite "palmable". Depends on your
    paw size but I guess they won't be smaller than mine ;-)

    The cursor is a bit more nervous than on regular mice (but all my others
    are non-optical and wired). AFAIR it was under $20 at Costco. But a bear
    to get out of a humongous molded-together plastic package. Those
    packages must be an environmental nightmare.
  13. Joerg

    Joerg Guest

    Checked in the doc files. The mouse from Costco is an LX-5.
  14. J.A. Legris

    J.A. Legris Guest

    Use separate mice and build yourself a multistorey mousehouse with
    different coloured mousepads on each level.
  15. Jim Thompson

    Jim Thompson Guest


    I'm up to my ears in work right now, or I'd dissect how it all works,
    and fix it... I still have all the USB documentation from when I
    designed the physical interface for Intel years ago.

    ...Jim Thompson

  16. If you have two mice or more, they start to breed. I started with
    two, and have well over 100 at the moment. :(

    There are serial, (The grandparents) PS/2, (The parents) USB (The
    rugrats) and even a few mutant wireless rodents hiding around here.

    Service to my country? Been there, Done that, and I've got my DD214 to
    prove it.
    Member of DAV #85.

    Michael A. Terrell
    Central Florida
  17. Rich Grise

    Rich Grise Guest

    Well, now we know who to blame for that nightmare of an excuse for an

  18. krw

    krw Guest

    It seems the server I'm using declared your original post to be spam.

    How about a KVM switch?
  19. Jim Thompson

    Jim Thompson Guest

    I just ordered a new one. My old IOGear GCS124U can't cope with
    modern USB mice.

    ...Jim Thompson
  20. The next step is to dispense with the KVM switch altogether and run one
    of the variants of VNC. I use TightVNC but don't remember why I chose it
    (Now where DID I put those old brain cells?).


    You use one machine as the "master" and connect your mouse, keyboard and
    display to it and on the "slave" machines you run a VNC server. On the
    master you run a "viewer" session for each slave you want to control and
    then switch between them like any other Windows app. Be sure to use the
    DFMirage mirror driver on the slaves.

    This is a very viable solution as long as your network is fast and there
    aren't too many screen updates happening on the slaves. Since you
    already have a KVM, you can leave it in place and only switch it when
    the bandwidth hit would be too high.
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