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Display Control
Combining Addressing Methods
You may use a combination of screen, workspace, and cursor-relative coordinates within a
single escape sequence.
Example: Move the cursor (and roll the text if necessary) so that it is positioned at the
character in the 70th column of the 18th row below the current cursor position.
Ec&a69c+18R
Example: Move the cursor so that it is positioned at the character 15 columns to the left of
the current cursor position in the 4th row currently visible on the screen.
Ec&a-1Sc3Y
Example: Move the cursor (and roll the text up or down, if necessary) so that it is positioned
at the character in° the 10th column of row 65 in the workspace.
Ec&a9c64R
Cursor Position Sensing
The current cursor position can be sensed by a program in either workspace-relative or
screen-relative coordinates. The procedure is for the program to send the appropriate escape
sequence, followed by a request for input from the terminal (INPUT command, in BASIC).
The terminal responds with the cursor position.
WORKSPACE-RELATIVE CURSOR SENSING. The following example illustrates sens-
ing the cursor position, in workspace-relative coordinates, when the cursor is at column 20,
row 40 in the workspace.
computer:
Ec a
terminal:
Ec&a020c040R
SCREEN-RELATIVE CURSOR SENSING. The following example illustrates sensing the
cursor position, in screen-relative coordinates. The cursor is at column 20, row 40 in the
workspace, but screen row 0 begins at workspace row 35.
computer:
Ec '
terminal:
Ec&a020cOOSY
WINDOW CONTROL
The window can be positioned in the workspace to display selected 24-row (one page) seg-
ments of the workspace. Movement is in row or page increments.
4-8
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