| 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.
Sources:
Page 1-2-17 of the official Nintendo Super NES documentation
https://archive.nes.science/nesdev-forums/f12/t9286.xhtml
https://forums.nesdev.org/viewtopic.php?p=186742&hilit=exlorom#p186742
https://forums.nesdev.org/viewtopic.php?p=270888&hilit=exhirom#p270888
https://problemkaputt.de/fullsnes.htm#snesmemorymap