![get ps2 emulator on mac os x yosemite get ps2 emulator on mac os x yosemite](https://i.ytimg.com/vi/cNkgoBDUwLM/maxresdefault.jpg)
This most certainly is UEFI ( hardware abstraction "software" layer) related and affects all devices that exist in ACPI abstraction, such as ps2 or serial imput versions of legacy kernels and as apple patched theirs in there as well for original apple keyboards.
![get ps2 emulator on mac os x yosemite get ps2 emulator on mac os x yosemite](https://cleverbell291.weebly.com/uploads/1/2/6/7/126704661/736466789.png)
I need a solution that works and "sticks" or I will have to retrograde these machines to Mavericks. As you can imagine, end users are frustrated as their computers become unusable. Restarting the computer has no beneficial effect. Sometimes clicking OFF the keyboard control panel options and then turning them on again cure the issue. Quicken 2007 (latest update), for example. In some applications no keys functions at all. Keys can stop working even in the Finder. Cut, Copy, Paste using the keyboard do not work at all. Filling out forms online is extremely problematic. In Safari keys work for awhile and then randomly stop responding. The Apple Extended keyboard (wired) AND the Apple Bluetooth Keyboard AND third party keyboards have major problems with some-or-all keys conking out. I am a Mac consultant and I am seeing this issue with MOST users who upgrade to Yosemite (10.10) on their iMacs.