User:Ben Boldt

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MMC6 ASCII Pinout (sandbox/in progress):

                                 ___
                                /   \
                               /     \
               (n) CPU A13 -> / 1  64 \ -> PRG A17 (r)
                       M2 -> / 2    63 \ <- CPU A14 (n)
               (unknown) ?? / 3   O  62 \ -> PRG A18 (r)
                    n/c -- / 4        61 \ -> PRG A14 (r)
                   n/c -- / 5          60 \ -> PRG A15 (r)
            (unknown) ?? / 6            59 \ -> PRG A13 (r)
           (unknown) ?? / 7              58 \ <- CPU A12 (nr)
              (VCC) ?? / 8                57 \ -- GND
             (VCC) ?? / 9                  56 \ -- VCC/batt
         VCC/batt -- / 10                   55 \ <- CPU A8 (nr)
             GND -- / 11              ( )    54 \ <- CPU A7 (nr)
          (VCC) ?? / 12                       53 \ <- CPU A9 (nr)
     threshold -- / 13                         52 \ <- CPU A6 (nr)
  (n) PPU A10 -> / 14                           51 \ <- CPU A5 (nr)
 (n) PPU A11 -> / 15                             50 \ -> PRG A16 (r)     Orientation:
  (unknown) ?? / 16                               49 \ <- CPU A4 (nr)    --------------------
              /             Nintendo MMC6             \                     48          33
              \      Package QFP-64, 0.8mm pitch      /                      |          |
(r) CHR A10 <- \ 17                               48 / <- CPU A3 (nr)       .------------.
 (r) CHR A16 <- \ 18                             47 / -> PRG /CE (r)     49-|            |-32
  (r) CHR A11 <- \ 19                           46 / <- CPU A2 (nr)         |  Nintendo  |
   (n) PPU A12 -> \ 20                         45 / <> CPU D7 (nr)          |O  MMC6B   O|
    (r) CHR A13 <- \ 21    ( )                44 / <- CPU A1 (nr)           |            |
     (r) CHR A12 <- \ 22                     43 / <> CPU D6 (nr)         64-|o           |-17
      (r) CHR A14 <- \ 23                   42 / <- CPU A0 (nr)             \------------'
               GND -- \ 24                 41 / <> CPU D5 (nr)               |          |
           VCC/batt -- \ 25               40 / <> CPU D0 (nr)                1          16
         (r) CHR A15 <- \ 26             39 / <> CPU D4 (nr)
        (n) CIRAM A10 <- \ 27           38 / -- VCC/batt       Legend:
 (nr) CHR /OE, PPU /RD -> \ 28         37 / -- GND             ------------------------------
  (nr) CHR /CE, PPU A13 -> \ 29       36 / <> CPU D1 (nr)      --[MMC6]-- Power
             (r) CHR A17 <- \ 30     35 / <> CPU D3 (nr)       ->[MMC6]<- MMC6 input
                 (n) /IRQ <- \ 31   34 / <> CPU D2 (nr)        <-[MMC6]-> MMC6 output
               (n) /ROMSEL -> \ 32 33 / <- CPU R/W (n)         <>[MMC6]<> Bidirectional
                               \     /                         ??[MMC6]?? Unknown
                                \   /                              n      NES connection
                                 \ /                               r      ROM chip connection
                                  V                                R      RAM chip connection

• All pins have internal protection diode from GND and to +batt except pins 4 and 5.
• Pins 4 and 5 measure infinite resistance to all other pins.
• The 3 VCCs (8,9,12) are NOT internally connected to each other.
• GND pins (11,24,37,57) are internally connected to each other.
• +batt pins (10,25,38,56) are internally connected to each other.

Battery Circuit:

   +------|>|----/\/\/------+------|<|-----O  NES 5V
+  |             1 kohm     |
  ---  3V                   |
 ----- Lithium              +--------------O  MMC6 VCC/Batt
   |   2032
-  |
   +---------------------------------------O  NES GND, MMC6 GND

Threshold Circuit:

           NES 5V  O----/\/\/----+
                       181 ohm   |
                                 |
                                 +-----O  MMC6 Threshold
                                 |
                       470 ohm   |
NES GND, MMC6 GND  O----/\/\/----+

NES-HKROM (Startropics 1) BOM:

R1  1 kohm
R2  181 ohm
R3  470 ohm
C1  22uF 6.3V Electrolytic
C2  10nF Ceramic
C3  10nF Ceramic
D1  Diode (0.6V Forward)
D2  Diode (0.6V Forward)
U1  PRG-ROM
U2  CHR-ROM
U3  CIC
U4  MMC6
Batt 2032 3V Lithium