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List overview
Download
thread

KVM

cb@mythtech.net
4 Jul 2005 4 Jul '05
2:24 a.m.
...
Everyone wants a truck load of $ for KVM switches and I figure for the price it might be more fun to build one but I've been struggling to locate a circuit diagram. I figure they're just a fancy switch of some type.
I found an 8 port KVM on ebay with a BIN price of $70 and something like $15 shipping. It was some generic brand, but it was rack mountable and came will all neccessary cables. I know at the time (a few months ago now), the guy had a bunch of them available. They were all listed as new (and mine certainly showed no signs of ever having been opened before). It has worked perfectly for me since I installed it. The only complaint I had about it was the size was a hair too wide for proper rack mounting. It fit inside standard 19" rack rails, but needed to be jammed into place, and then the holes to mount it to the rack didn't line up with the holes in the rails. Less then a milimeter off, but it was enough to keep the screws from going in. (I got around it by first mounting the ears, and then forcing the KVM into place between the ears, and then screwing the ears to the KVM... its in, and works fine, it just took a little effort) The unit only supports PS/2 devices, however I am successfully using it with PS/2 -> AT keyboard adaptors on a few machines. I have no idea if using an auto sensing PS/2/Serial mouse and adaptors at the computer would work thru it or not (I've not tried to do that). If I need another 8, I'd probably buy another one of them without question (it is also daisy chainable, so if I need another 8, I can tie them together and still use just one Key/Mouse/CRT for all 16 devices). Alas, I don't recall the brand name, but if you can't turn it up on ebay just by looking at descriptions, let me know and I'll check the name on Tuesday when I am back in the office. -chris <http://www.mythtech.net>
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