BlackBox currently sells one. The part number is KVUSB-PS2. It is really pricey though.
https://www.blackbox.com/en-us/store/product/ … erter/KVUSB-PS2

A couple years ago I found a couple on eBay form a different company for cheap but they were really expensive new as well.

I don't think you need something active as much as smart in that sitch, it needs to process and separate the signals, then turn them into PS/2, so microcontroller board that does USB host mode is probably going to come in.

"Active" converters are the ones that translate the signal - aka have a microcontroller.

The ones I have at home can be taken apart as they are built in a metal project box.

I'm not sure that there is a single USB to dual PS2 converter out there. I've never come across one.... unless there is one specifically made for a KVM switch. With the regular active ones being so expensive, I can't imagine how much one with a built in USB host that would split the keyboard and mouse signals would be.

Found the converter I have at home. Slightly cheaper than the BlackBox one:
https://www.kvm-switches-online.com/usb-ps2-r.html

Found another on Amazon by TrippLite that is "only" $73:
https://www.amazon.com/Minicom-Converter-Swit … 2/dp/B00404YD8W

What is the brand/model USB KVM that you are using?

One with a microcontroller is active yes, but active does not necessarily mean microcontroller, as it would in some conversions just be doing level shifting or analog mode signal mixing or massaging, or more complex stuff with shift registers and logic, maybe implemented in a PAL or custom ASIC that isn't a microcontroller.

I've got this thing which I got from the local second hand computer refurbishing shop. You can change the usb gender with an adapter if you need to. LAVERS is the brand on the bag it came with. Only cost a few NZ pesos.

Caluser2000 wrote on 2021-09-15, 20:40:

I've got this thing which I got from the local second hand computer refurbishing shop. You can change the usb gender with an adapter if you need to. LAVERS is the brand on the bag it came with. Only cost a few NZ pesos.

I don't think it will work in reverse but feel free to prove me wrong.

I doubt those work in reverse, but the alternative would be to get one of those for every USB system and use a PS/2 KVM.. which might come in under $70 if you find everything cheap.

cyclone3d wrote on 2021-09-15, 20:43:

Caluser2000 wrote on 2021-09-15, 20:40:

I've got this thing which I got from the local second hand computer refurbishing shop. You can change the usb gender with an adapter if you need to. LAVERS is the brand on the bag it came with. Only cost a few NZ pesos.

I don't think it will work in reverse but feel free to prove me wrong.

Just make a custom usb adapter- done.

Not unlike null modem cables really.

Caluser2000 wrote on 2021-09-15, 20:47:

cyclone3d wrote on 2021-09-15, 20:43:

Caluser2000 wrote on 2021-09-15, 20:40:

I've got this thing which I got from the local second hand computer refurbishing shop. You can change the usb gender with an adapter if you need to. LAVERS is the brand on the bag it came with. Only cost a few NZ pesos.

I don't think it will work in reverse but feel free to prove me wrong.

Just make a custom usb adapter- done.

Not unlike null modem cables really.

How would that ever work? USB and PS2 are completely different.

Yes, you can use some USB mice and keyboards with a simple adapter, but those that work like that were made to support both USB and PS2 protocols.

cyclone3d wrote on 2021-09-15, 21:19:

Caluser2000 wrote on 2021-09-15, 20:47:

cyclone3d wrote on 2021-09-15, 20:43:

I don't think it will work in reverse but feel free to prove me wrong.

Just make a custom usb adapter- done.

Not unlike null modem cables really.

How would that ever work? USB and PS2 are completely different.

Yes, you can use some USB mice and keyboards with a simple adapter, but those that work like that were made to support both USB and PS2 protocols.

Think about for a while....

Caluser2000 wrote on 2021-09-15, 21:27:

cyclone3d wrote on 2021-09-15, 21:19:

Caluser2000 wrote on 2021-09-15, 20:47:

Just make a custom usb adapter- done.

Not unlike null modem cables really.

How would that ever work? USB and PS2 are completely different.

Yes, you can use some USB mice and keyboards with a simple adapter, but those that work like that were made to support both USB and PS2 protocols.

Think about for a while....

You would need a USB host that could split out the separate keyboard and PS2 signals. ( 1 USB input and 2 PS2 outputs)

From the sound of it, that is what the OP wants to do. A simple adapter cable will not work and neither will a "null modem" type cable work for a gender changer in the adapter above. The controller on that adapter is almost 100% designed to only work in one direction.

I have an adapter similar to Caluser2000's, and it doesn't work because the PS/2 port itself is female, so it won't plug into the Trendnet switch.

As for what model the USB KVM is, it's this one from JideTech: amazon.com/gp/aw/d/B071Y6C516?psc=1&ref=ppx_pop_mob_b_asin_title

I just wanted to see if there were any simple, cheap ones that I wasn't seeing in my searches. If all there is are those $70-$115 options, I might just want to survive with two keyboards. Either that or I can try swapping them, in that instead of the Trendnet one going to the USB one, but the other way around, and attaching the PS2/video cable to the USB one with the converter I already have. I'll work it out when I have tomorrow.

I haven't seen any splitters like that. "Splitting" USB input into separate PS/2 keyboard and mouse signals is very different from the opposite, that would pretty much make it closer to something like a USB-PS/2 hybrid KVM (which actually exists). However, a USB-PS/2 hybrid KVM (which accepts either PS/2 or USB input and can output in either way as well) can be overkill as you can literally connect all your PCs to that KVM if it has enough ports, making other KVMs unnecessary.

Such KVM can also make some standard USB wireless keyboards and mice work on PCs connected via PS/2. However, you won't be able to access special features of these devices (since they output as generic USB or PS/2 input devices), and USB input devices which deviate too much from the standard (like some high-end Corsair devices) are unlikely to work correctly.