User:Persune

Hello! I usually write music, or work on hardware/software projects for the Famicom. From time to time, I like to investigate certain aspects of the Famicom, be it audio, video, or otherwise.

TODO:
  - learn wiki markup
  - write and publish personal research here:

      - Famicom cartridge PCB measurements, dimensions and footprints
        https://www.nesdev.org/wiki/Famicom_cartridge_dimensions
          Completed so far:
            - FC HVC-TGROM-01
            - FC HVC-CNROM-256K-01
            - TODO: publish HVC-ETROM-01 measurements

      - NES cartridge PCB measurements, dimensions and footprints
        https://www.nesdev.org/wiki/NES_cartridge_dimensions
          Completed so far:
            - NES-EWROM-01
            - TODO: measure unlicensed cartridge PCBs

      - NES/Famicom equivalent opamp amplifier gain
            - TODO: RF Famicom HVC-CPU-07, RF Famicom HVC-GPN rev, AV Famicom HVCN-CPU rev, Sharp Twin Famicom rev

Some bits i'm drafting:

Famicom EPSM access

Due to the lack of EXP pins on the Famicom's cartridge pinout, an equivalent version does not have direct access to any of the methods above.

For the universal $4016 access, one may directly connect OUT1 from pin 11 of the Famicom's expansion port to the EPSM, or replicate OUT1 by latching $4016.D1 writes with external circuitry.

For the memory mapped access, the default circuit is the $401C-F addressing.

If another mode of mapper access is desired, a 2x15 pin header may be provided with the bare signals required for use with an external daughterboard.

   EPSM    | Daughterboard  |    EPSM
           +----------------\
    GND -- |01            30| -- +5V
CPU A11 -> |02            29| <- M2
CPU A10 -> |03            28| <- CPU A12
 CPU A9 -> |04            27| <- CPU A13
 CPU A8 -> |05            26| <- CPU A14
 CPU A7 -> |06            25| -- NC 
 CPU A6 -> |07            24| -> EPSM A1
 CPU A5 -> |08            23| -> EPSM A0
 CPU A4 -> |09            22| -> EPSM CE3
 CPU A3 -> |10            21| -> EPSM /CE2
 CPU A2 -> |11            20| -> EPSM /CE1
 CPU A1 -> |12            19| -- NC
 CPU A0 -> |13            18| -- NC
CPU R/W -> |14            17| <- /ROMSEL
     NC -- |15            16| -- NC
           +----------------/

For advanced data bus latching and controller access, an auxiliary pin header is available to be used, in conjunction with the one above

    EPSM     | Daughterboard  |     EPSM
             +----------------\
   CPU D7 -> |01            24| -> YMF288 D7
   CPU D6 -> |02            23| -> YMF288 D6
   CPU D5 -> |03            22| -> YMF288 D5
   CPU D4 -> |04            21| -> YMF288 D4
   CPU D3 -> |05            20| -> YMF288 D3
   CPU D2 -> |06            19| -> YMF288 D2
   CPU D1 -> |07            18| -> YMF288 D1
   CPU D0 -> |08            17| -> YMF288 D0
  EPSM A1 -> |09            16| -> YMF288 /CS
  EPSM A0 -> |10            15| -> YMF288 A1
 EPSM CE3 -> |11            14| -> YMF288 A0
EPSM /CE2 -> |12            13| <- EPSM /CE1
             +----------------/

Famicom / NES cartridge measurements

Label measurements

Note that these measure the dimensions of the label stickers themselves, not the allocated area on the plastic shell.

Front label measurements

Famicom 1st party short shells (SMB3 JP HVC-UM) - 90mm x 45.5mm

Famicom 1st party tall shells (Nobunaga no Yabou: Sengoku Gunyuuden KOE-NU) - 95mm x 53.5mm

NES shell (Romance of the Three Kingdoms II NES-XL-USA) - 50mm x 96.5mm

Back label measurements

Famicom 1st party short shells (SMB3 JP HVC-UM) - 99.5mm x 28.5mm

Famicom 1st party tall shells (Nobunaga no Yabou: Sengoku Gunyuuden KOE-NU) - 99.5mm x 28.5mm

NES shell (Romance of the Three Kingdoms II NES-XL-USA) - 78.5mm x 31mm