Here is the Linear B keyboard.

LinearB Keyboard

You MUST download the Linear B Font in order to use the keyboard.  To DOWNLOAD the Linear B Font, scroll down to:

Friends & Links & CLICK on: Linear B TTF Font.

Note also that typing a letter in lower case (LC) will produce a different result from typing a letter in uppercase (UC).  Here are a few examples:

If you type A UC, you get the Linear  B character DA.

If you type A LC, you get the the Liinear B character TA.

If you type B UC, you get NU, B LC gives you SU, C UC gives you NI, C LC gives you SI, and so on.