EXT Port Pinout

The EXP Port is located on the back of the console and is used primarily to interface to the CD Unit, TurboBooster or the db Grafx Booster. There are also RGB, composite video, and stereo audio signals found on the EXT Port which can be used to significantly increase the video and audio output quality.

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C SNDR GND HuD CEK A17 A13 A11 GND D2 D4 D6 D7 A1 A3 A4 A6 GND A15 A19 GND Vout Sync Blu
B SNDin CDD HSM /WR VU A8 /OE D0 D3 D5 HSn A0 A2 VD6 A5 A7 A12 A16 A20 /RDY IRQ2 /RST Grn
A SNDL Vout VS A18 A14 A9 A10 D1 DCK VSn Vin VD8 VD7 Vin VD5 VD4 VD3 VD2 VD1 VD0 GND Vid Red
Power Audio/Video Data Bus Address Bus System Functions Video Bus (?)