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TESmart makes a 4 PC, dual monitor version. They have an HDMI and a display port version. Sorry, but as far as I can tell I donβt think they make a USB 3.0 version. Not sure why you need 3.0. I have their 2 PC, dual monitor version. One of the laptops I have connected to it is using only USB 3.0 ports and I have had no issues with it.
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Dual monitor and USB3 KVMs do exist, but you're going to pay a large premium for the privilege of needing something much fancier than the baseline models.
CS1944DP - 4-Port USB 3.0 4K DisplayPort Dual Display KVMP Switch[^]
Did you ever see history portrayed as an old man with a wise brow and pulseless heart, weighing all things in the balance of reason?
Is not rather the genius of history like an eternal, imploring maiden, full of fire, with a burning heart and flaming soul, humanly warm and humanly beautiful?
--Zachris Topelius
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Trendnet are great kit, I have one on my server stack.
8 port one, bit of an older model these days, but has not let me down yet.
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You mean, a KeVin Marois switch ?
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If all are Windows-based systems, why not just use RDP?
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Has MS dropped the requirement that the computer on one end, IIRC being connected to, be running a pro version of windows? Because pro licenses are more expensive than KVMs.
Edit: Also, the OP said he needed both Windows and Mac support.
Did you ever see history portrayed as an old man with a wise brow and pulseless heart, weighing all things in the balance of reason?
Is not rather the genius of history like an eternal, imploring maiden, full of fire, with a burning heart and flaming soul, humanly warm and humanly beautiful?
--Zachris Topelius
modified 26-Apr-22 10:05am.
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Robert Bolin 2022 wrote: If all are Windows-based systems, why not just use RDP?
Windows Home can connect to RDP, but cannot be RDP'd to.
Some Linux (e.g. Debian) can RDP to other places (but Debian has a nasty habit of not connecting unless you have 'native' access to it first, which rather defeats the purpose).
You can ignore the rest of this comment / response because, by drawing the diagram, I have realised that a solution to my KVM problem could be a single 4-Port HDMI KVM as I am not actually using the VGA slots as I am directly connecting the VGA to the monitor, bypassing the VGAs on the KVM.
I'm looking for a KVM that supports mixed HDMI and VGA input devices (o/p not such a problem as my monitor is switchable between HDMI and VGA) as I have 3 PCs, one of which does not have HDMI. I know I can use HDMI to VGA converters and use a VGA-only KVM, but that would lead to a loss of resolution.
Currently, I have 2 Two-Port KVMs (one for HDMI and one for VGA) which I have daisy-chained USB Ins to USB Outs, as per the diagram below.
___________
+-----+ +-----+ / \ +-----+
| | | | | Monitor | | |
| PC1 | | PC2 | | | | PC3 |
| | | | \ __________/ | |
+-----+ +-----+ HDMI . . VGA +-----+
. | . | . . . |
. | . |_ _ _ _ _ _ _ _ _ _ _ _ . _ _ _ . _ _ _ _ _ . |
. | . . . | . |
. | ......... .......... ..................... |
. |_ _ _ _ _ . . | |
. | . . | |
......... | . _ _ _ . _ _ _ | |
. | . | . | | |
. | . | . | | |
+------------------------------+ | +------------------------------+
| HDMI USB HDMI USB HDMI | | | VGA USB VGA USB VGA |
| IN IN IN IN OUT | | | IN IN IN IN OUT |
| PC1 PC1 PC2 PC2 | | | PC1 PC1 PC2 PC2 |
| | | | |
| KVM-1 | | | KVM-2 |
| | | | |
| <-- various USB ports --> | | | <-- various USB ports --> |
+------------------------------+ | +------------------------------+
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|_ _ _ _ _ _ _ |
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SIONAL LOST FIFTY CONSERVATIVE WHO SIGNED THE TREATY
Not that it makes sense to me...
βReal stupidity beats artificial intelligence every time.β
β Terry Pratchett, Hogfather
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SIGNA (signal loses L (50))
TORY conservative
SIGNATORY who signed the treaty.
(thanks for saving me from having to unearth my Baudot chart!)
Software rusts. Simon Stephenson, ca 1994. So does this signature. me, 2012
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Nice!
(By the way there is an error in the 3rd letter - it is 11000, which is an O and not G, which is 11010)
βReal stupidity beats artificial intelligence every time.β
β Terry Pratchett, Hogfather
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Sorry, I'm a little rusty. I was too lazy to check it for errors. I was using Wordle blocks. 
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Hm. Been googling "SIONA" to try and work out what the heck you were up to! That a wasted couple of weeks while the tapes get sent off and come back with your punching errors.  (From personal experience a looong time ago...)
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Yep, you are up next. 
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Care to explain for us mere mortals 
"Life should not be a journey to the grave with the intention of arriving safely in a pretty and well-preserved body, but rather to skid in broadside in a cloud of smoke, thoroughly used up, totally worn out, and loudly proclaiming βWow! What a Ride!" - Hunter S Thompson - RIP
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Nope, never did! Learned something new this morning 
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Something we oldies started with; in my case via paper tape which was used as the main input on our systems. Take a look at the first picture on row 2 (LEO III/6 and LEO III/7 pics), the paper tape reader is in the foreground. That was the first system I worked on.
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My very first programming class (circa 1976) used a paper punch terminal to write programs in BASIC -- apparently I never learned the paper tape encoding. By the next semester I advanced to 80 column punch cards and UNIVAC assembler.
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We moved from the old LEO system to a Univac 1108 in 1968, and I started learning Assembler when I switched from operating to programming shortly thereafter.
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No I haven't Richard, it was punch cards when I first started
"Life should not be a journey to the grave with the intention of arriving safely in a pretty and well-preserved body, but rather to skid in broadside in a cloud of smoke, thoroughly used up, totally worn out, and loudly proclaiming βWow! What a Ride!" - Hunter S Thompson - RIP
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We had cards and paper tape when I started. Although paper tape was the primary input medium. There was a room full of young girls, just outside the computer room, who spent all day punching billing information onto TTY tape, which we operators then processed.
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