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Furthermore, there are blank keys available which the user can use
to form visible partitions or clusters of key tops on the programmable
keyboard. When the user wants to make a group of keys on the
programmable keyboard clearly separated from the rest part of the
keyboard for certain specific application, he/she can use the blank keys
to replace the normal individual keys around the area. The top surface of
a blank key is at the ground level of the key stroke for other keys (ref.
Fig. 3-7). The blank key will not be pressed down when pressed. The
user may order for accessional quantity of the blank keys as option for
his/her application.
There are also double key and quad key available for the user to
configure the programmable keyboard such that the most frequently used
keys may occupy larger areas. The double key occupies two “vertically”
adjacent positions and uses only the bottom position for key content (ref.
Fig. 3-3). The quad key occupies a two by two matrical area and uses
only the lower right position for key content (ref. Fig. 3-4).
An example of using the above mentioned alternate key tops is
shown in Fig. 3-7.
Fig. 3 - 2 Fig. 3 - 3 Fig. 3 - 4
Fig. 3 - 5 Fig. 3 - 6
Springy
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protuberance