I played a round of Neo Turf Masters to test out my cart.
Here are the results:
Set High Score
Load High Score (power off for 30 seconds)
Save Management (item #4)
Check your "Save State" menu and see if it's populated.
This is from the manual:
If it's not, you might want to try clearing the backup ram from the multi-cart menu.
Do you have uni-bios?
If you do - are your uni-bios region/mode (MVS/AES) settings saved?
What about soft-dips? Are those settings being saved?
Set the date/time in the system menu and see if that is retained.
Without a regular cart to use - we can use uni-bios settings, soft-dips, or calendar to determine if your backup ram is working.