OFF       : 0
EEPROM 4k : 1
EEPROM 16k: 2
SRAM      : 3
SRAM 768  : 4
FLASHRAM  : 5
ROM ID or CRC HI can be used for game detection. (check "ROM Info" menu for details)
Two samples below
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N6=1 (Dr. Mario. ROM ID detection)
0xce84793d=3 (Donkey Kong [f2]. CRC detection)