LastXY Register for WP34S

[Marcus von Cube]

(12-01-2014 05:10 PM)brouhaha Wrote:  The undo save could be in the non-battery-backed 4K of RAM. If you turn the 34S off, or leave it idle so it turns itself off, then undo would not be available when you turn it back on.

Sorry to disappoint you but the non volatile memory is lost between keystrokes, not when the device is "turned off". When you see the display contents and nothing else is going on, the core is powered down, just the display controller is active.