Change PuTTYs Default Scrollback Values

1. Go to Run (Win+R), type regedit and press enter.

2. In the registry editor, press Ctrl+F to bring up the search box and search for SimonTatham

3. Expand the result SimonTatham > PuTTY > Sessions

4. Select a session for which scrollback value need to be changed. Scroll down on the right pane until you find the value ScrollbackLines

5. Double click on ScrollbackLines and change its value to 200000. Make sure you click the decimal radio button before modifying the value.

6. Press OK and you are done. Launch PuTTY and observe the default settings.