(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.

