6530 Programmer's Guide

Conversational Mode Operation
6530 Programmer’s Guide 2-9
This function involves only cursor movement, unlike the tab key, which
causes the 6530 to transmit the required number of spaces necessary to
move the cursor to the next tab stop.
Tab Settings This group of escape sequences sets or clears tab stops. The 6530
maintains one set of tab stops, which applies to all rows on the screen.
Set Tab (Esc 1)
The Esc I sequence sets a horizontal tab stop at the current cursor column
position. Once a tab is set, it applies to that column position for all rows
on the screen until it is cleared. The tab stop does not take up a position
on the screen.
Clear Tab (Esc 2)
The Esc 2 sequence clears a previously set tab stop at the current cursor
column position. This tab stop is cleared from that column for all rows.
Clear All Tabs (Esc 3)
The Esc 3 sequence clears all previously set tab stops from all column
positions.
Roll/Page
Operations
This group of escape sequences moves display memory lines on the
screen and selects the display page. These operations do not affect the
contents of display memory or the relative position of the cursor on the
screen.
Roll Up (Esc S)
The Esc S sequence rolls display memory lines up one row on the screen.
This is similar to the automatic roll up operation described in “Cursor
Movement” on page 2-7. However, no scroll operation occurs when the
last line of display memory appears at the bottom of the screen; further
Esc S sequences are ignored at this point. The cursor remains in the same
relative position.
Roll Down (Esc T)
The Esc T sequence rolls display memory lines down one row on the
screen. This is similar to the automatic roll down operation described in
“Cursor Movement” on page 2-7. If the screen contains the first line of
display memory, further Esc T sequences are ignored. The cursor remains
in the same relative position.