Polk Audio Sirius Satellite Radio Tuner SRH1000 - Manual (Page 31)

If the new alert was successfully stored in memory, an Artist/Song/Game
Stored pop-up screen followed by an X Used/Y Empty screen will be
displayed for one and two seconds respectively. X is the total number
of listings stored in memory, and Y is the total number of memory
listings still available for storage.
Figure 16
If the MEMO button is pressed, and all of the memory spaces are full, a
Memory Full screen will be displayed for one second.
Figure 17
A Replace–Cancel screen will then be displayed which will allow
you to choose whether to replace an existing alert stored in memory,
or to cancel storing the alert to memory.
Figure 18
31 OPERATION