Intermec VT220/ANSI, Руководство программиста

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SECTION 6
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PEN*KEY 6400 Computer
6-2 VT220/ANSI Terminal Emulation Programmer’s Reference Guide
The screen modes govern which portion of the larger VT220
terminal’s screen the PEN*KEY computer first presents
and how the window moves as the cursor moves.
Center Cursor Mode
Center cursor mode works best for applications that use the
entire VT220 data stream’s 80-character by 24-line logical
display. In this mode, the cursor remains in the center of
the PEN*KEY computer’s window.
As the cursor moves within the window, the PEN*KEY com-
puter’s display window moves to keep it centered. When
the cursor moves off the right, left, top, or bottom edge of
the larger 80x24 display, the window remains fixed despite
the cursor’s movement.
Corner Mode
Corner mode begins with the window in the upper left cor-
ner of the larger VT220 terminal. It keeps the cursor in the
lower right corner of the display. Corner mode works best
for applications that use the upper left corner of the logical
screen.
As the cursor moves off the right or bottom edge of the
PEN*KEY computer’s display, the window moves to show
the cursor. When you use corner mode with the gold-col-
ored key, you can move the cursor a predetermined number
of key presses in all four directions.
Page Mode
Page mode provides predefined pages within the larger
VT220 terminal. The size of these pages depends on the
number of rows and columns selected for display.