Will the ps2 controller work on a ps1?

[Kitsune Sniper]

Wireless Playstation 2 controllers don't work. I've tried my Logitech and Force 2 gamepads on my PSOne with no luck.

So if they work, it's just the wired variety.

I can't get some third-party PS1 accessories to work properly on a PS2. My Konami gun clone won't work, but any old Guncon clone does.

But anyway. If it's official Sony, it'll work.