FDS expansion port pinout
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The FDS has an expansion port located at the rear of the RAM adapter, covered by a shutter. (Labelled as Expansion Port B on the Twin Famicom) The unreleased Famicom Network Adapter was designed to use this port. An unlicensed device called the ILine-PC (Iライン-PC) is known to connect this port to a PC.
Diagram
Open end view of the external connector.
-------
| -- \
+5V -- | 1||2 | <> EXT6
EXT5 <> | 3||4 | <> EXT4
EXT3 <> | 5||6 | <> EXT2
EXT1 <> | 7||8 | <> EXT0
SOUND <- | 9||10 | -- GND
| -- /
-------
Signal descriptions
- +5V : 5V Power supply from the main voltage regulator.
- GND : 0V Power supply.
- EXT0..6 : Bidirectional - outputs from $4026.D0..D6 and inputs to $4033.D0..D6. (open-collector with 4.7K ohm pull-ups)
- EXT1..2 are altered when $4025.D5 = 0 but its purpose is unknown.
- SOUND : Analog audio output, after the FDS audio is mixed in.
