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Display 10 receives commands and data from controller 12, as indicated at 14, and its associated keyboard 16 initiates keystroke signals which are transmitted to controller 12, as indicated at 18.
English (United States)
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Dual Speed Cursor Operation
Display 10 receives commands and data from controller 12, as indicated at
14, and its associated keyboard 16 initiates keystroke signals which are
transmitted to controller 12, as indicated at 18.
One of the functions of controller 12 is to cause a cursor 20 to be displayed
by 10. A cursor move key 22 on keyboard 16 causes signals to be sent to
controller 12 whereby the controller instructs display 10 to move the cursor 20.
This may be done, for example, by changing the content of an I/O address
register in 10.
Usually, cursor move key 22 is a "typamatic" key. That is, as long as it is
held down, its result is repeated at a given rate, causing cursor 20 to move
across the display screen.
The use of an existing control key, such as a "shift" or other control key 24, in
conjunction with the cursor move key 22 (or any other typamatic key) can be
used to effectively increase the typamatic rate. As an example, if holding the
cursor move key 22 down causes the controller 12 to be interrupted at a 10 cps
rate, the cursor 20 may be advanced one position for each interrupt processed. If
the shift and cursor move keys 24,22 are held down together, the controller will
be interrupted at a 10 cps rate, but the controller can be programmed, in that
case, to move the cursor two positions for each interrupt processed.
This combination of keys will allow the operator to home in on a position in
high-speed mode by holding both keys down. The operator th...