Official Name Mode 20 Mode 21 Mode 22 Mode 23 Mode 25
Scene Name LoROM HiROM ExHiROM
Bank Size 32k 64k
ROM contiguous? No Yes

Note that these Map Mode numbers are hexadecimal. For example, Pino's lorom template is advertised as being mode $20. When the CPU clock is running at normal speed (2.68 MHz) in Mode 20, FFD5h is set to 20h. At high speed (3.58 MHz) in Mode 20 the high nibble of FFD5h in incremented, so it is 30h instead.


Page 1-2-17 of the official Nintendo Super NES documentation