PS/2 keyboards and mouse? No.
With 3rd party USB to PS2 adaptor, it should do it depends on the host OS USB driver stack.
The NEC USB device supports the USB 2 modes OHCI/UHCI & EHCI which covers all devices on the market.
As part of the compatibility testing of the Amy'05 a number of common PC peripherals will be tested, I will add a generic USB-PS2 adaptor to the list.
Ian
Developer Amy'05 project.