In most cases, 6KRO is enough for gaming. But when you are an enthusiast of something, you do what you can, not just what you should.
Filco has diodes for every switch, but it *only* does 6KRO over USB. However, it can do NKRO over PS/2. USB has its advantage because it is Plug-and-Play. Whereas a PS/2 keyboard has to be connected before the computer it is connected to is booted up for the OS to recognize it. Ah, the dilemma.
You can have the best of both worlds. USB’s Plug-and-Play convenience and the unnecessary ability to have more than 6 keys registered at once. How, you ask? With
Soarer’s XT/AT/PS2/Terminal to USB Converter with NKRO.Soarer’s converter has been around for a year. Most of the time it is used to get old IBM keyboards to work on PCs with USB. Its best kept secret, however, is that it works with any PS/2 keyboards. And Soarer’s firmware makes it possible to get NKRO over USB.
So, if you build a Soarer converter, you too can have NKRO over USB with your Filco keyboards, or any keyboard that can do NKRO over PS/2 (e.g. IBM Model F, Cherry G80 POS keyboard, Leopold). I just built one myself.
All you need is a Teensy, a female 6-pin mini DIN connecter, a few wires, a soldering iron, and an hour or two. Uploading Soarer’s firmware to a Teensy is very easy, and can be done on Windows, OS X, and Linux.
Go check out Soarer’s wiki
here.