The value n determines whether the line recall feature is active only for command prompts, or for both command prompts and READ commands:
When 1 (true) READ commands and command prompts can use the line recall feature.
When 0 (false) only command prompts can use line recall.
0 or 1. The default is 1.
On the page System Administration > Configuration > Additional Settings > Compatibility, in the LineRecall row, select Edit. Choose true (selected) or false (cleared).