I'm not sure what would happen if you tried to plug in a standard PS2 (Non-Amiga) keyboard. I wouldn't try it without checking further first. I am almost sure that at the very least it won't work.
I think Northgate (or someone) made a keyboard ages ago that had some sort of mode selection on the bottom that allowed use with an Amiga.
I also remember having an Amiga to PC keyboard interface years ago with a small IC in it. It was flakey, the reset key combination never worked and it would stream random characters on re-boots all the time.
Try Redrumloa. I think he has some PS2<>Amiga KB adapters.
Jeff
BTW congrats on the A4000D! I just got my second one the other night. It was driving me crazy not being able to play with it until the next day. I had to go dig a mouse and keyboard out of my storage.
