Re: DEC Keyboard Question

From: Christoph Gartmann (gartmann_at_non.immunbio.mpg.de.sens)
Date: 01/26/05 

Date: Wed, 26 Jan 2005 11:18:07 +0000 (UTC)

In article <5nxJd.6532$mv4.3353@news.cpqcorp.net>, "FredK" <fred.nospam@nospam.dec.com> writes:
>
>There are two types of KVM switches - dumb pass-thru and "smart" switches.
>The dumb ones simply pass the data through with little intellegence. The
>only thing that they need to do at least for VMS is to cause a power up
>sequence to be generated when the KB is connected. This way we will
>reprogram the KB automatically. The smart ones actually have a uProc that
>handles the KB and then emulates a KB on the other side. These keyboards
>need to either know about the extended codes - or at least be smart enough
>to pass them through. In the worst case, these KVMs handle USB as well, and
>then they need to know how to turn the extendd PS2 codes into the right USB
>codes.

Interesting. So I would like to get an explanation for the phenomenon I
experience with our Rose switches:
1) Extended keyboards like my LK411-AG connected to the switch work as expected
   in "mode 3" with any Alpha so far. The same is true for a 3-button mouse.
2) But after a reboot of the Alpha the keyboard is recognized by OpenVMS as
   one of these PC keyboards (only 15 function keys. As soon as I plug a real
   keyboard into the Alpha, type a compose character and reconnect the KVM
   switch all is working fine again.

Regards,
   Christoph Gartmann 

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