Trying to find a keyboard

[RequieM]

Hi,

I currently use an old ps2 membrane microsoft keyboard. I bought a steelseries 6gv2 (black cherry mx) and I much prefer membrane. Is there any good ps2 keyboards with full NKRO that are membrane? if not are there switch types that are similar to how membrane works?(basically no mid point between down and up). Im confused why mechanical keyboards are linear all the way from the start of the pressing to them botteming out. Wouldnt it be much more effective for gaming etc if keys bottemed out as soon as you applied pressure?

[RequieM]

PS/2 or USB?
PS/2 wins on three fronts: First, it supports full n-key rollover. Second, 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. There are two types of USB transfer modes - the interrupt transfer mode (USB polls keyboard, when key is sensed the USB controller sends the interrupt to the CPU), and the isochronous transfer mode, which reserves a certain amount of bandwidth for the keyboard with a guaranteed latency on the bus. Unfortunately, there are absolutely no keyboards made that use the latter, because special controllers would have to be used, thus making it cost prohibitive.