And some more info I found out

http://www.clickykeyboards.com/index.cfm/fa/items.main/parentcat/11298/subcatid/0/id/179740

There are passive adapters (costs pennies and may not work) vs. a signal converter ($ 20-30).  The new keyboards are $10-20 at Staples, as I recall.

And they have a page about the PC AT keyboards etc. at their site too.  http://www.clickykeyboards.com/index.cfm

And a catalog of old keyboards still in use. http://www.clickykeyboards.com/index.cfm/fa/pages.main/pageID/3