(r) this line goes to the ROM only. (s) this line is Shared between the ROM, MMC/chip, and Nintendo (n) this line connects to the NES cart edge only, and not the ROM (w) this line connects to the WRAM only and nowhere else MMC6 Chip: (64 pin QFP) [Made by Kevin Horton (khorton@iquest.net)] ---------- There is one known flavour: 'MMC6B' I suspect there may be an 'A' rev. also. 48 33 | | .---------. 49-| |-32 | | | MMC6B | | | 64-| |-17 \---------' | | 1 16 Pin# Function Pin# Function ---- -------- ---- -------- 1 - PRG A13 (n) 33 - R/W 2 - M2 34 - PRG D2 (s) 3 - GND 35 - PRG D3 (s) 4 - GND 36 - PRG D1 (s) 5 - GND 37 - GND 6 - NC 38 - +batt 7 - GND 39 - PRG D4 (s) 8 - +5V 40 - PRG D0 (s) 9 - +5V 41 - PRG D5 (s) 10 - +batt 42 - PRG A0 (s) 11 - GND 43 - PRG D6 (s) 12 - +5V 44 - PRG A1 (s) 13 - threshold 45 - PRG D7 (s) 14 - CHR A10 (n) 46 - PRG A2 (s) 15 - CHR A11 (n) 47 - PRG /CE (r) 16 - NC 48 - PRG A3 (s) 17 - CHR A10 (r) 49 - PRG A4 (s) 18 - CHR A16 (r) 50 - PRG A16 (r) 19 - CHR A11 (r) 51 - PRG A5 (s) 20 - CHR A12 (n) 52 - PRG A6 (s) 21 - CHR A13 (r) 53 - PRG A9 (s) 22 - CHR A12 (r) 54 - PRG A7 (s) 23 - CHR A14 (r) 55 - PRG A8 (s) 24 - GND 56 - +batt 25 - +batt 57 - GND 26 - CHR A18?(r) 58 - PRG A12 (s) 27 - CIRAM A10 (n) 59 - PRG A13 (r) 28 - CHR /RD (s) 60 - PRG A15 (r) 29 - CHR /CE (s) 61 - PRG A14 (r) 30 - CHR A17 (r) 62 - PRG A18?(r) 31 - /IRQ 63 - PRG A14 (n) 32 - PRG /CE (n) 64 - PRG A17 (r) Notes: A10 & A11 do not go to this chip. Threshold: Tied to a resistor divider between +5V and GND; resistor to +5V is 180 ohms, resistor to ground is 470 ohms.