PC-Engine / TurboGrafx-16 EXT Port PinoutThe EXP Port is located on the back of the console and is used primarily to interface to the CD Unit and TurboBooster. 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 |
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| B | SNDin | CDD | HSM | /WR | VU | A8 | /OE | D0 | D3 | D5 | HSn | A0 | A2 | VD6 | A5 | A7 | A12 | A16 | A20 | /RDY | IRQ2 | /RST | Grn |
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| A | SNDL | Vout | VS | A18 | A14 | A9 | A10 | D1 | DCK | VSn | Vin | VD8 | VD7 | Vin | VD5 | VD4 | VD3 | VD2 | VD1 | VD0 | GND | Vid | Red |
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| | Power | | Audio/Video | | Data Bus | | Address Bus | | System Functions | | Video Bus (?) |
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