Typewriting machines – Key-board or key lever-actuating mechanism – Including mechanism for activating keys
Patent
1997-10-22
1999-04-27
Hilten, John
Typewriting machines
Key-board or key lever-actuating mechanism
Including mechanism for activating keys
400476, 400479, B41J 508
Patent
active
058972579
ABSTRACT:
The subject invention relates to a type of keyboard with expandable function keys, on the keyboard are a number of expanded function keys, said function keys are connected to the additional I/O cable for the microprocessor in the circuit structure in the keyboard, to coordinate with the original keyboard scanning matrix, forming a new scanning matrix, hence the default codes of said function keys may coordinate with the execution of the application programs in the window system, so the operator may directly control the existing functions of a peripheral device (multimedia) on the keyboard, with the control panel operation displayed on the monitor screen, with one IRQ connector pin of said microprocessor being connected jointly to the negative poles of three LED diodes, while the positive poles of each LED diode is connected to one line of the scanning matrix, so said keyboard may be compatible with an XT microprocessor in its application; so said function keys may be defined in the original scanning matrix that has not yet been defined, and the operator may directly control the existing functions of a peripheral device on the keyboard; and that said function keys may be set to "in-use" mode as required by the operator.
REFERENCES:
patent: 4906117 (1990-03-01), Birdwell
patent: 4964075 (1990-10-01), Shaver et al.
patent: 5667319 (1997-09-01), Satloff
Hilten John
Silitek Corporation
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