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I21 is an unsupported keyboard, which probably means the keyboard is bad. Contact Geo. Beters Co. for a keyboard rebuild @ 800-392-8085 tell them O'Reilly sent you.
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121 says that the keyboard is not supported which means that the K.B. is bad. To get around this hold the code key, press & relase the "L" key type 001 rel the code key this sets the T/W to a US keyboard. You will have to do this until you replace the keyboard or repair it see my tip under WW1000.
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