These are the odds-n-ends of Nintendo boards. Usually, these boards were used only once. Some of these have 2nd party mapper chips (i.e. FME-07), some are Chip on Board (COB). Others are just plain weird!
NES-DRROM - 128K PRG, 64K CHR, MIMIC-1.
NES-MH - 64K PRG (Bus conflicts), 16K CHR.
NES-QJ - 256K PRG, 256K CHR, MMC3. 74HC161 sub-mapper.
NES-WH - 128K PRG, 64K CHR, MMC1.
NES-21G-CPU-72P - 32K PRG, 8K CHR RAM.
NES-EVENT - 256K PRG, 8K CHR RAM, MMC1.
SSS-NROM-256 - 32K PRG, 8K CHR ROM.
SSS-CNROM - 32K PRG, 32K CHR ROM.
SSS-UNEPROM - 128K PRG, 8K CHR RAM.