Try this link.it may help. I have an A1000 keyboard that I wired to the CD32 wich means it works on the A4000 as well.........with an adaptor to make the plug bigger, it will also work with the A2000 and 3000.
http://www.l8r.net/technical/t-keyboard.shtmlthere is a better keyboard layout somewhere on the internet.but I cant find it.........maybe in Aminet or a CD32 website.