PS/2 is gone in many modern motherboards.
For example, I'm planning a sandy bridge build and the pro version doesnt have a ps/2 port:
http://www.microcenter.com/single_product_results.phtml?product_id=0364206

only the deluxe one does:
http://www.microcenter.com/single_product_results.phtml?product_id=0366668



has any one tried pci cards or similar like this?
http://www.newegg.com/Product/Product.aspx?Item=N82E16815150153&cm_re=pci_ps%2f2-_-15-150-153-_-Product



I just want to make sure the latency doesnt increase compared to onboard ps/2 and that it fully support NKRO

a PS/2 keyboard has its own IRQ slot, no polling of any kind - will that also be the case here?

I couldnt find any other threads regarding this, please link if already discussed, thanks!

Personally, I prefer this one: http://geekhack.org/showwiki.php?title=Island:14618

I think it will be the basis for the inline colemak/dvorak converter, as well, which I believe will eventually be released as a kit, or at least we will have parts lists.

is n keyrollover going to cease to exist once motherboard manufacturers stop including the ps/2 connection on modern motherboards?

There are fully functional 18 key rollover USB controllers out there, so probably not.

Custom built adapters allow NKRO over USB, the one designed by Soarer that I use with my 122 certainly does. The 6+4 limitation is largely arbitrary.

Custom built adapters allow NKRO over USB, the one designed by Soarer that I use with my 122 certainly does. The 6+4 limitation is largely arbitrary.

true, i suppose it's difficult to think of any instances when you'd need more than 6 key rollover for any sort of use that isn't extremely specialized. it's more so a novelty/status type of vibe i'm getting from keyboards boasting about n key rollover.

Why put time and money into designing something most people will never use?

hah, touche.

while it isn't something i'm necessarily worried that keyboard manufacturers aren't producing or putting effort into. or bummed that ps/2 connections may eventually die out completely. i was more or less just asking out of curiosity.



i also feel like the superiority of ps/2 over usb is more so about about "PS/2 keyboards aren't polled, but are completely interrupt based. And third, it is impossible for it to be delayed by the USB bus being used by other devices."   as opposed to key rollover limitations vs no key rollover limitations.  

direct quote from the mechanical keyboard guide above.

Well, except for the use of the word "third" it seems quite accurate to me. USB is a CPU based polled serial protocol, PS/2 is hardware interrupt based. That means that USB keyboards drain away a minute fraction of your CPU whether they are being used or not. PS/2 only drains CPU when you actively push the key.

Now, this makes 0 practical difference when you're actually USING the keyboard. It only matters when you aren't. And even then, barely at all.

But if you are saturating your USB bus, it can have a negative impact on other devices on the bus, including mice and keyboards. Though I haven't seen that happen on hardware younger than 10 years old or so.

So yeah, it's basically a non-issue. The only advantage PS/2 has in my mind is better support for 122 key keyboards.

That sounds alot like a joystick game to me then. Like wing commander.

true, i suppose it's difficult to think of any instances when you'd need more than 6 key rollover for any sort of use that isn't extremely specialized. it's more so a novelty/status type of vibe i'm getting from keyboards boasting about n key rollover.

 
Oh yeah? Try playing 2 player fighting game, sharing one keyboard. Until I found out about NKRO I couldn't figure out why I couldnt do certain moves when a friend and I were playing!