Memory:free:state - Keysight Technologies P Series Programming Manual

MEMory:FREE:STATe?

This query returns the amount of memory free for save/recall registers. The format
of the response is:
<bytes_available>,<bytes_in_use>
Syntax
Example
MEM:FREE:STAT?
Keysight N8262A Programming Guide
MEM :FREE :STAT ?
This command queries the amount of free
memory for save/recall registers.
MEMory Subsystem 7
297