Reputation: 17http://www.japan-guide.com/e/e2047.html
http://www.omniglot.com/writing/japanese_katakana.htm
try this: you need to put the cursor on the box where you need to input that characters. then try to change your incoding to japanese by clicking the EN near the system tray bar to JP and click it again and set the settings and change the A to hiragana then you can now input those codes.