Re: DEC Keyboard Question

From: Ken Fairfield (my.full.name_at_intel.com)
Date: 01/25/05 

Date: Tue, 25 Jan 2005 11:47:51 -0800

FredK wrote:

> 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.

Thanks, Fred. There's the theory lesson for you. Now to the lab.

Problem is, given the range of KVM switches in the field, only the
"smart" ones have been shown to work (reasonably) connected to both
a PC and a VMS system. If you know differently, PLEASE SHARE!

By the way, as near as my co-worker and I have been able to figure
out, the LK463 connected directly to the USB port of a laptop
running Windows XP does NOT recognize the "extra" keys.

Same keyboard connected to the same laptop, but using the
USB-to-PS/2 adapter and plugged into the PS/2 port on a
port-replicator (no PS/2 connector on the nwere laptops) works
fine, all 108 keys.

Apparently, the needed enhancements to the USB keyboard driver
are not included in Windows XP (would be nice if HP supplied
such a driver)...

     -Ken 

-- 
I don't speak for Intel, Intel doesn't speak for me...
Ken Fairfield
D1C Automation VMS System Support
who:   kenneth dot h dot fairfield
where: intel dot com

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