NROM (mapper 0):
No modifications nessesary

CNROM (mapper 3):
No modifications nessesary

CNROM 32 Pin EPROM (mapper 3):
Bend up pin 1, 2, 31 and 32
Solder Pin 31 to hole 28 (+5V)
Solder Pin 32 to hole 28 (+5V)

UNROM (mapper 2):
Bend up pins 1, 2, 24 and 31
Solder pin 2 to hole 22 (A16)
Solder pin 24 to GND (OE)

UNROM 32 Pin EPROM (mapper 2):
Bend up pin 1, 2, 24, 31 and 32
Solder pin 2 to hole 22 (A16)
Solder pin 24 to GND (OE)
Solder pin 31 to hole 28 (+5V)
Solder pin 32 to hole 28 (+5V)

E[K/W]ROM (mapper 5):
PRG AND CHR:
Bend up pin 1, 2, 24, 30 and 31
Solder pin 1 to hole 30
Solder pin 2 to 24
Solder pin 24 to hole 31
Solder pin 30 to hole 1
Solder pin 31 to hole 2

SNROM (mapper 1):
Bend up pins 1, 2, 24, 30 and 31 (or cut tracks 2, 24 and 30)
Solder pin 2 to hole 24 (A16)
Solder pin 24 to GND (OE)
Solder pin 30 to hole 1 (A17)

SKROM (mapper 1):
PRG socket:
Bend up pins 1, 2, 24, 30 and 31 (or cut tracks 2, 24, 30 and 31)
Solder pin 2 to hole 24 (A16)
Solder pin 24 to GND (OE)
Solder pin 30 to hole 1 (A17)
Solder pin 31 to hole 2 (A18)
CHR socket:
Bend up pins 1, 2, 22, 24, 30, 31 (or cut tracks 2, 22, 24 and 30)
Solder pin 2 to hole 24 (A16)
Solder pin 22 to hole 31 (CE or CHR /A13)
Solder pin 24 to hole 2 (OE or CHR /RD)
Solder pin 30 to hole 1 (A17)

SNROM -> SVROM Conversion (mapper 1):
Bend up pins 1, 2, 24, 30, and 31 (or cut tracks 2, 24, 30 and 31)
Solder pin 2 to hole 24 (A16)
Solder pin 24 to GND (OE)
Solder pin 30 to hole 1
Cut track from MMC1 pin 11 to WRAM pin 20
Solder pin 31 to pin 11 of MMC1 chip (A18)
Solder pin 20 of WRAM to Ground (CE (E1) or CHR /A13)

SLROM (mapper 1):
PRG socket:
Bend up pins 1, 2, 24, 30 and 31 (or cut tracks)
Solder pin 2 to hole 24 (A16)
Solder pin 24 to GND (OE)
Solder pin 30 to hole 1 (A17)
CHR socket:
Bend up pins 1, 2, 22, 24, 30 and 31 (or cut tracks)
Solder pin 2 to hole 24 (A16)
Solder pin 22 to hole 31 (CE or CHR /A13)
Solder pin 24 to hole 2 (OE or CHR /RD)

SNROM -> SUROM Conversion (mapper 1):
Bend up pins 1, 2, 24, 30, and 31
Solder pin 2 to hole 24 (A16)
Solder pin 24 to GND (OE)
Solder pin 30 to hole 1 (A17)
Cut track from MMC1 pin 11 to WRAM pin 20
Solder pin 31 to pin 11 of MMC1 chip (A18)
Solder pin 20 of WRAM to Ground (CE (E1) or CHR /A13)

TSROM -> TKSROM conversion (mapper 4):
Lift MMC3 Pin 10 (CHR A10)
Solder a wire from MMC Pin 12 (CHR A17) to NES Connector Pin 22
Cut the original CHR A17 trace to MaskROM

TKROM & TSROM (mapper 4):
PRG socket:
Bend up pins 1, 2, 24, 30 and 31 (or cut tracks 2, 24, 30 and 31)
Solder pin 2 to hole 24 (A16)
Solder pin 24 to GND (OE)
Solder pin 30 to hole 1 (A17)
Solder pin 31 to hole 2 (A18)
CHR socket:
Bend up pins 1, 2, 22, 24, 30, 31 (or cut tracks 2, 22, 24 and 30)
Solder pin 2 to hole 24 (A16)
Solder pin 22 to hole 31 (CE or CHR /A13)
Solder pin 24 to hole 2 (OE or CHR /RD)
Solder pin 30 to hole 1 (A17)

FKROM (mapper 10):
PRG socket:
Bend up pins 1, 2, 24, 30 and 31 (or cut tracks 2, 24, 30 and 31)
Solder pin 2 to hole 24 (A16)
Solder pin 24 to GND (OE)
Solder pin 30 to hole 1 (A17)
Solder pin 31 to hole 2 (A18)
CHR socket:
Bend up pins 1, 2, 22, 24, 30, 31 (or cut tracks 2, 22, 24 and 30)
Solder pin 2 to hole 24 (A16)
Solder pin 22 to hole 31 (CE or CHR /A13)
Solder pin 24 to hole 2 (OE or CHR /RD)
Solder pin 30 to hole 1 (A17)

TKROM -> TNROM conversion (mapper 4):
PRG socket:
Bend up pins 1, 2, 24, 30 and 31 (or cut tracks 2, 24, 30 and 31)
Solder pin 2 to hole 24 (A16)
Solder pin 24 to GND (OE)
Solder pin 30 to hole 1 (A17)
Solder pin 31 to hole 2 (A18)
CHR RAM conversion:
Seat the RAM chip 2 pins back (pin 1 of RAM is pin 3 of socket)
cut track to hole 3, 22, 24, 28 and 29
Solder pin 1 to hole 30 (+5V)
Solder pin 20 to hole 31 (CE or CHR /A13)
Solder pin 22 to hole 2 (OE or CHR /RD)
Solder pin 26 to hole 28 (+5V or RESET)
Solder pin 27 to NES pin 56 (CHR /WR), you will probably need to glue in the missing tab on the PC board that goes into the NES, I used a thin piece of metal and super glued it, then sanded it with fine sand paper

UNROM -> AOROM conversion (mapper 7):
Bend up pins 1, 2, 24, 30 and 31
remove '32 chip
cut track to pin 6 of '161
Solder pin 2 to pin 13 of '161 (A16)
Solder pin 18 to pin 6 of '161 (D4)
Solder pin 24 to GND (OE)
Solder pin 30 to pin 12 or '161 (A17)
Bridge gap between pins 10 and 11 where '32 was (A14)
Bridge gap between pins 3 and 13 where '32 was (A15)
remove solder gap for either V or H
Solder NES pin 22 (CIRAM A10) to pin 11 of '161

UNROM -> UOROM conversion (mapper 2):
Bend up pins 1, 2, 24, 30, 31, and 32
Bend up MC74HC32 pin 3
Solder pin 2 to hole 22 (A16)
Solder pin 24 to GND (OE)
Solder pin 30 to MC74HC32 pin 3
Solder pin 32 to hole 28 (+5V)

Any VRC4 to VRC4b
Lift pin 3 of VRC4 (skip if coming from a VRC4a)
Lift pin 4 of VRC4
Solder pin 3 of VRC4 to PRG pin 11 (skip if coming from a VRC4a)
Solder pin 4 of VRC4 to PRG pin 12

Any VRC4 to VRC4c
Lift pin 3 of VRC4
Lift pin 4 of VRC4
Solder pin 3 of VRC4 to PRG pin 6
Solder pin 4 of VRC4 to PRG pin 5

Any VRC4 to VRC4d
Lift pin 3 of VRC4
Lift pin 4 of VRC4 (skip if coming from a VRC4a)
Solder pin 3 of VRC4 to PRG pin 9
Solder pin 4 of VRC4 to PRG pin 10 (skip if coming from a VRC4a)

Any VRC4 to VRC4e
Lift pin 3 of VRC4
Lift pin 4 of VRC4
Solder pin 3 of VRC4 to PRG pin 10
Solder pin 4 of VRC4 to PRG pin 9

Any VRC4 to VRC4f
Lift pin 3 of VRC4
Lift pin 4 of VRC4
Solder pin 3 of VRC4 to PRG pin 12
Solder pin 4 of VRC4 to PRG pin 11