| 摘要 |
According to this invention, a keyboard is constituted by 15 keys, and 4-bit data is sent to a keyboard controller in response to depression of a key. The keyboard controller detects the permutation of two continuously depressed keys. A key code is picked on the basis of the permutation with reference to a table stored in advance, and is sent to a system main body. The keyboard controller updates the table to another table in response to depression of a specific key.
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