I found one person who compiled a list:
https://member.keymusician.com/Help/Keyboards … ltipleKeys.html

With that said, even if you can't get any of the exact keyboards there, chances are anything will be good than this garbage:

up and left on the arrow keys, only one at a time

I started a post here as also ran into this problem when getting back into retro gaming.

Keyboards that pass the n-key or ghosting test

Maybe get a usb keyboard and a usb to ps2 adapter

I think he would have, if not for this:

fractal5 wrote:

I have a PS/2 KVM switchbox which doesn't work well when using a USB to PS/2 adapter.

Possibly a Unicomp would do a good job since they presumably still use the original circuitry carried over from Lexmark/IBM and not a cheapened design?

UNICOMP keyboards do 2KR, like most keyboards from the era. Never had troubles with rollover gaming, though.

i was looking at filco/leopold as they have ps/2 compatibility via adapter (plus a few models with beige/grey that look nice and retro) but ended up buying a 2nd hand Steelseries 7G (all black) which is the native PS/2 version. it works perfectly via my KVM and is solid as a rock. havent had any issue with button combo presses in win 8 on a gigabyte X99 board or on any of my old pcs in my sig with any OS.

i found it on fbook marketplace for under 30 aud. they came out around '09 i believe so you shouldnt have problem finding someone whos upgrading to some RGB usb keyboard.