Edit 3: According the FCEUX source, mapper 43 supports Mr. Mary, a pirate hack of Mario Bros. I cannot track down a ROM.
Mr. Mary 2 (Unl)[!].nes
Edit 4: Mapper 63 is supported by Nintendulator and it calls it, "Hello Kitty 255 in 1". I cannot track down a ROM.
255-in-1 (As) [!].nes
Edit 5: Mapper 123 is a pirate MMC3 mapper supported by FCEUX. I do not know which ROMs use it, but FCEUX refers to the mapper as H2288.
EarthWorm Jim 2 (KaSing) [!].nes
Ultimate Mortal Kombat 3 (14 People) (Unl) [!].nes
Edit 7: Mapper 126 is "Super Joy" according to Nintendulator, which is a pirate MMC3 mapper. I cannot track down a ROM.
PowerJoy 84-in-1 (PJ-008) (Unl) [!].nes
Edit 8: Mapper 162 is a Waixing pirate ROM mapper. I do not which games use it. FCEUX suggests it is a variation of mapper 164.
Chong Wu Jin Hua Shi (Pet Evolve) (ES-1085) (Ch).nes
Legend of Zelda - Tri Force (ES-1096) (Ch).nes
Shen Gui Chuan Qi (The Mummy) (ES-1109) (Ch).nes
Xi You Ji Hou Zhuan (Ch).nes
Edit 9: Mapper 170 is supported by FCEUX and it looks like a very simple mapper. But, I have no clue what games uses it.
Shiko Game Syu (Unl).nes
Edit 10: FCEUX calls mapper 220, "Debug Mapper" and "KS7057". As with the others, the associated ROMs are a mystery.
I wrote this comment in Mesen's code:
//Only seems to be for Gyruss (mapper 220) - other games marked as mapper 220 are not supported by any emulator that I could find (or remapped to another board type).
There are a number of 220 roms:
2-in-1 - Street Dance + Hit Mouse (Unl) [!].nes
Boogerman II (Rex-Soft) [!].nes
Desert Storm (Ch) (Wxn).nes
Gyruss (FDS Conversion,Kaiser) (Unl) [!].nes
Mortal Kombat V Pro (Unl) [!].nes
Street Fighter II - The World Warrior (Unl) [a3][!].nes
Edit 11: According to Mesen, mapper 236 is equivalent to BMC-70IN1 for which there are UNIF ROMs.
This is likely because Nestopia assigned the same to 236 - I do not have any mapper 236 iNES rom.
Most of what I have is meant to be from the latest release of GoodNES. I did scavenge some roms from other sources here and there while trying to add support for as many mappers as I could to Mesen, but I didn't really keep track of the source, though. Aside from the mapper 220 roms, these all work in Mesen and at least 1 other emulator (since my implementations are usually based on either Nestopia or FCEUX's code)