6530 Programmer's Guide

Block Mode Operation
3-48
6530 Programmer’s Guide
end-row and end-column are decimal numbers that specify the
ending location for the areas to be read (read end address).
K terminates the sequence.
For example, the following sequence reads an area starting at row 5,
column 5 and ending at row 10, column 72;
1BH - 5;5;10;72 K
The Esc - K sequence functions like the Esc ] sequence, except for the
difference in format.
Clear Display
Memory
This group of escape sequences clears or erases all or parts of the
selected page.
Clear Memory to Spaces (Esc I)
The Esc I sequence clears a specified area of the selected page. The Esc I
sequence uses normal addressing format as described in “Cursor and
Buffer Addressing” on page 3-13. The escape sequence has the following
format:
Esc I start-row start-column end-row end-column
where:
start-row and start-column are encoded ASCII characters
that specify the beginning location of the area to be cleared (start
address).
end-row and end-column are encoded ASCII characters that
specify the ending location of the area to be cleared (end address).
The escape sequence blank fills the entire area specified by the start
address and end address (inclusive). The operation does not cross page
boundaries. If the end address is less than the start address, no operation
occurs.
In protect submode, if a field-start address falls within the specified area,
that field is deleted. If, as a result of the deletion, the cursor is positioned
in a protected field, the 6530 performs a forward tab to move the cursor
to the next unprotected position on that page.
Note In EM3270 mode, this sequence stores nulls rather than
spaces in the screen buffer.