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On Wed, Aug 17, 2011 at 2:17 PM, <meino.cramer@×××.de> wrote: |
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> Paul Hartman <paul.hartman+gentoo@×××××.com> [11-08-17 21:08]: |
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>> On Wed, Aug 17, 2011 at 1:42 PM, <meino.cramer@×××.de> wrote: |
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>> > Paul Hartman <paul.hartman+gentoo@×××××.com> [11-08-17 18:02]: |
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>> >> On Tue, Aug 16, 2011 at 10:01 PM, <meino.cramer@×××.de> wrote: |
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>> >> > Hi, |
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>> >> > |
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>> >> > I have attached an old keyboard (PS/2-connector) via an |
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>> >> > USB-PS/2-adaptor to my PC. |
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>> >> > |
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>> >> > When typing too fast (...) the three LEDs of the keyboard flashes |
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>> >> > and everything typed then is typed as if the CTRL-Key constantly |
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>> >> > locked (I am using the X-window-system with openbox as windowmanager. |
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>> >> > There is no session management.) |
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>> >> > |
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>> >> > It is possible to revert back to normal when I switch |
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>> >> > from X-windows to the Linux console (CTRL-ALT-F1) and back |
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>> >> > to X (CTRL-ALT-F7). |
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>> >> > |
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>> >> > My question is: |
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>> >> > What part (PC? Adapator? Keyboard?) gets out of sync here is |
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>> >> > "resetted" (somehow), while switching between console and |
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>> >> > X-windows? |
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>> >> > |
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>> >> > How can I reset the behaviour without switching? How can I |
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>> >> > prevent the behaviour completly? |
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>> >> |
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>> >> FWIW I have experienced that same behavior with several PS/2 to USB |
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>> >> adapters, in Windows, in Linux, etc. I think it's a common problem |
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>> >> with those adapters in general. I've never used one that didn't "go |
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>> >> crazy" a few times a day. |
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>> >> |
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>> > Hi Paul, |
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>> > |
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>> > after some recursive investigations :) via internet I found some |
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>> > interesting things: |
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>> > 1) Yes, your are completly right: It is the USB-PS2-adapter, which |
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>> > goes crazy. |
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>> > 2) No, you are wrong, the reason is different. |
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>> > ;) :) |
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>> > 3) The answer is 41.999998 (calculated by a P90). ;) |
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>> > |
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>> > The reason for stuck CTRL/SHIFT keys is a missing pull-up |
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>> > resistor from the clock and the data line to the +5V line |
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>> > of the PS2 connection. Or in other words: Adding these resistors |
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>> > seem to fix the problem in most cases. |
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>> > See the link below (which describes the process for a IBM Model M keyboard. Seems true |
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>> > for other old PS2 keyboards as mine, too): |
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>> > http://ps-2.kev009.com:8081/ohlandl/keyboard/modify_keyboard/Model_M_Modifications.html |
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>> > |
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>> > The PS2 goes crazy because the high level gets too low without the |
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>> > additonal pull up resistors. But the "origin of the reason" is not |
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>> > the adapter, but the low high levels of the old PS2 line as such. |
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>> > |
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>> > I did find these information that late (after posting to this list) |
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>> > by searching for informations about certain different usb-PS/2-adapter. |
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>> > Sorry, when answering the other half of my own question.... :) |
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>> |
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>> Very interesting info, it's good to know the real reason why it always |
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>> seems like a "universal" problem with those adapters. |
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>> |
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>> In the end, to solve my own problem, I bought two Unicomp keyboards |
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>> which are the same as the old heavy IBM keyboards but with USB |
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>> built-in. ;) |
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>> |
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> |
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> (my question is based only on curiosity...) |
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> |
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> Are the Unicomp Model Ms of the same quality and tactile/audible |
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> feeling as the original IBM model Ms? |
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|
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Yes, in fact it's exactly the same. Unicomp was formed by former |
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IBM/Lexmark employees who bought the original Model M manufacturing |
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equipment and rights to the original designs and parts from IBM. So |
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it's very much the same as Model M but available with updated with |
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modern features like USB and windows keys (if desired) and different |
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colors. They are still manufactured in the US at Unicomp's offices and |
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not outsourced to China or anywhere like that. |
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|
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USD $80 seems like a lot of money for a keyboard to some people I talk |
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to, who are used to getting the crap $5 rubber keyboard from the |
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computer store. :) but if you spend every day typing, like I do, it's |
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really a small amount to pay. |
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|
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I've been using mine for a few years now and am extremely happy with |
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them. I have the original huge one (the "Customizer") and the smaller |
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one with a trackpoint mouse in the middle (it's smaller but still |
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heavy and clicky, using the same spring mechanism as the big guy). |