I am going to denote in the wiki the mappers 256-259 defined by FCEUX. And as
UNIF is dead, I'm going to be bold and assign/document a bunch of 260+ mapper numbers to so-far UNIF-only boards in the wiki. (I'll use the Submapper Proposals page for any submapper assignments.):
Code:
260 BMC-NTD-03 Asder 20-in-1
261 BMC-11160 Micro Genius 6-in-1 Cartridge (MGC-023)
262 UNL-SHERO Street Heroes/侍魂 (Shìhún, by Sachen)
263 UNL-KOF97 Boogerman II, King of Fighters '97 (by Rex Soft)
264 UNL-YOKO Mortal Kombat II, Master Fighter VI' (by Yoko)
265 T-262 Multicart
266 UNL-CITYFIGHT City Fighter IV
267 (no UNIF board) 8-in-1 JY-119 24M Multicart
268 COOLBOY
269 (no UNIF board) Games Xplosion 121-in-1, 15000-in-1, 18000-in-1: OneBus hardware with additional bankswitch registers, also mangled CHR data lines
270 (no UNIF board) Game Prince RS-16: OneBus hardware with additional bankswitch register
271 BMC-22026 MGC-026
272 (no UNIF board) Pirate Kid Dracula
273 (no UNIF board) Pirate Gremlins 2
512 (no UNIF board) 中國大亨 (Zhōngguó Dàhēng, a.k.a. "Millionaire II", incorrectly labelled "Chuugoku Taitei", by Sachen)
513 UNL-SA-9602B 美少女 夢工場三 (Měishàonǚ Mènggōngchǎng 3, a.k.a. "Princess Maker", by Sachen)
514 UNL-DANCE2000 Subor Type 2a (小霸王 卡拉OK), 32 KiB PRG-ROM granularity
515 (no UNIF board) Family Noraebang
516 (no UNIF board) EduBank
517 (no UNIF board) Kkachi-wa Nolae Chingu (UNROM with custom Microphone ADC)
518 (no UNIF board) Subor Type 2b (跳舞天使 - 動感 2000, 小霸王 Subor V), selectable 16/32 KiB PRG-ROM granularity
UNL-VRC7 turns out to be compatible to a normal Konami VRC7, and if any relevant incompatibilities are discovered, a submapper should then be proposed for Mapper 85. UNL-YOKO is somewhat similar to the Cony mapper 83, but with addresses different enough to justify a new mapper number, especially given that the current mapper 83 is already enough of a mess.
More UNIF->NES 2.0 mappers to come as I research and implement them in emulation.