HUNTER OPERATION
SECTION 2.6
2.6.3
VER.V09F
4) Transparent Movement:
The transparent movement of the virtual screen window is
primarily controlled by inputs, both from the keyboard and the
serial port. If HUNTER is required to accept an input from,
say, the keyboard then the window will automatically be moved to
allow the viewing of the immediate area of the virtual screen
centred around the present cursor position, thus displaying any
prompts which may have been required by either a Basic program
or a CP/M type program.
It must be noted that printing text onto the virtual screen will
not move the window. However, if any part of the virtual screen
which is presently in view on the LCD is changed by, say, a
PRINT statement, then these changes will be reflected on the
LCD, thus always giving a true representation of the virtual
screen.
If HUNTER is accepting input from the keyboard and the cursor
reaches the forty-first position of the virtual screen, then the
window will be moved laterally so that the cursor is now
positioned mid-way across the LCD, as soon as the forty-first
character is entered, thus displaying the previous 20 virtual
screen characters and the following 20 virtual screen
characters.
If HUNTER is waiting for input and the looking keys are used to
move the window, a valid input will cause the window to
automatically revert to its original position prior to the use
of the looking keys. This facility does not force the user to
press the 'INS' key in order to restore the original position of
the window when in this mode,
For further information on cursor addressing see LOCATE in Part
5, BASIC FUNCTIONS and section 2.5.3,
NOTE: The virtual screen window does not operate in Graphics
mode.
MOVING TI-IE CURSOR
To move the cursor in the required direction it is only
necessary to press the appropriate cursor control key.
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