HP 54710A User's Reference Manual page 326

Waveform Menu
Waveform
To memory
To memory selects which of the available memory locations the oscilloscope
saves the waveform to. Pressing the To memory softkey toggles among the
nonvolatile memory locations. If the waveform takes up more than 64K on a
D model mainframe, the memories are paired or grouped together. The
memories are grouped as needed to store the waveform. For example, in the
menu at the left, the To memory softkey shows that the you can store the
waveform into memory pairs m1 and m2, m2 and m3, or m3 and m4.
When a waveform is saved to a memory, it overwrites any data that was
previously stored in that memory. All pulse measurements or functions using
that memory location are recalculated. If the waveform display is on, then
the display is also updated.
Waveform memories are nonvolatile so the data is not lost if you press the
Autoscale softkey, turn off the power, or set the oscilloscope to the default
settings. A waveform memory contains a single waveform record, including
the horizontal and vertical scaling parameters. Therefore, you can make
parametric measurements on stored waveforms or use them as operands in a
function. You can also recall the waveform for future comparison or analysis,
print it, save it to a disk, or load it from a disk.
It takes less time to store and recall data to waveform memories, than to
store the same data to the disk drive. Therefore, you may find it more
convenient to use the four waveform memories for storing data temporarily,
and the disk drive for storing data permanently.
Save
The Save softkey copies the selected waveform to the selected memory. If
you are saving a persistence trace to a waveform memory, only the last
waveform record is saved to that memory. that is because waveform
memories store only single-valued, time-ordered data, and persistence traces
are multivalued sets of data.
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