CPU  (p/n: RP2A03G) [Made by Kevin Horton (khorton@iquest.net)]
-------------------


Pins 39,38, and 37 correspond to STA $4016 bits D0,D1, and D2 resp.
Pin 36 goes low during an LDA $4016, and pin 35 goes low during an
LDA $4017.

Audio 1 is the output for the two squarewave channels, and
Audio 2 is the output for triangle, noise, and PCM.

Audio outputs are raw. What you hear coming out of the NES is mixed and has
passed through filters.

The NES's CPU is considered to lack decimal mode.

                                  .----\/----.
                                  |          |
                        Audio 1 - |01      40| - +5V
                        Audio 2 - |02      39| - Strobe on sticks
                           /RST - |03      38| - Exp. conn pin #44
                             A0 - |04      37| - Exp. conn pin #45
                             A1 - |05      36| - /OE for stick #1
                             A2 - |06      35| - /OE for stick #2
                             A3 - |07      34| - /NMI
                             A4 - |08      33| - R/W
                             A5 - |09      32| - /IRQ
                             A6 - |10      31| - M2
                             A7 - |11      30| - GND (Abort?)
                             A8 - |12      29| - 21.47727Mhz CLK
                             A9 - |13      28| - D0
                            A10 - |14      27| - D1
                            A11 - |15      26| - D2
                            A12 - |16      25| - D3
                            A13 - |17      24| - D4
                            A14 - |18      23| - D5
                            A15 - |19      22| - D6
                            GND - |20      21| - D7
                                  |          |
                                  `----------'
                                       CPU
