Not as common as PS/2 KVM switches but they did exist, I had one or two at one 
time.  I found them to be troublesome to use.  ADB doesn't deal well with being 
switched.  It's been a while so I don't recall the details but I think what 
happens is the mouse or keyboard goes unresponsive for a while.

Also if the Mac isn't connected to the monitor when it boots up there is no 
video output and it can't be started without restarting the computer with the 
monitor connected.

Clark Martin
KK6ISP
Yet another designated driver on the information super highway.

> On Feb 6, 2016, at 9:06 AM, Wesley Furr <wes...@megley.com> wrote:
> 
> Were KVM (Keyboard/Video/Mouse) switches ever common for older Mac's with ADB 
> and DB-15 video?  I've got a 4-port PS/2 VGA KVM switch on my PC at home, and 
> I have an ADB/DB15 to PS2/VGA adapter that works with it...but I would like 
> to have the ability to hook up or two Mac's as well...long story, but would 
> be nice  if I could switch the Mac's on the ADB/DB15 side.  Just searched a 
> bit on ebay and couldn't find anything, which was kinda surprising.  Does 
> anyone have any insight?  maybe I just didn't come up with the right search  
> phrase?  Or maybe they just weren't a common item?
>  
> 

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