HP 54710A User's Reference Manual page 310

The oscilloscope remains declassified until a key is pressed, an HP-IB
command is sent over the bus, a plug-in is changed, or the power is cycled.
When the oscilloscope declassifies the memory in the mainframe, the
following actions are performed:
•
Acquisition is stopped.
•
Zeros are placed in RAM memory except for the following nonvolatile
memory locations:
Normal mainframe calibration
Normal plug-in calibration (located in the plug-in)
Best accuracy calibration
Boot and system common variables
Clock memory
The portion of the display RAM that holds the software for the graphics
processor
•
All measurements are turned off.
•
The default setup condition is stored in all of the setup memories.
•
The oscilloscope is placed in the default setup condition.
See Also
Chapter 14, "Setup" for the default setup conditions.
Update system firmware
The operating system for the oscilloscope is located in the system ROM
inside the oscilloscope. The oscilloscope does not need a disk in the disk
drive in order to operate. The Update system firmware softkey is for loading
new system firmware into the oscilloscope. Installing firmware is simply a
matter of installing the system disk in the disk drive, then pressing the
Update system firmware softkey and following the directions on the display.
Utility Menu
System Configuration
19–9