| 摘要 |
PURPOSE:To execute to lock an unnecessary key of a keyboard by an operator in the job site, by providing a table for registering effectve/ineffective of a key in a device, and constituting so that contents of this table can be changed from the outside. CONSTITUTION:In accordance with each key of a keyboard 10, a table for registering effective/ineffective of a key is provided. A data inputted from the key passes through an input buffer circuit 4, and its effective/ineffective is decided by the table 5. As a result, a data corresponding to an ineffective key is cancelled, and only a data corresponding to an effective key is brought to such processing as display onto a pitcure surface, etc. When changing the contents of the table 5, an unnecessary key of a keyboard 10 is locked by use of a microcomputer 6. |
