Interactive Connector Diagram
Click or tap any pin in the diagram below to inspect its signal assignment, electrical specification, and wire colour standard.
Supported Systems / Found On — Retro Machine Hubs
This connector is used on the following retro computer systems. Click any colour-coded badge below to open its full board-level repair, diagnostic, and schematic Machine Hub:
Connector Specifications
Full Pin Assignment & Wiring Reference
| Pin | Signal Name | Direction | Electrical Spec / Role | Wire Colour / SCART / Adapter Target |
|---|---|---|---|---|
| 1 | AUDIO LEFT (L) | Out | 5-Pin/8-Pin DIN Pin 1: Line-Level Stereo Left Audio Out (EXT Pin A1) | White RCA / SCART Pin 6 |
| 2 | GND (0 V Ground) | GND | 5-Pin/8-Pin DIN Pin 2 (Bottom Center): 0 V Video & Audio Ground (EXT C1/C22) | Black / All SCART Grounds |
| 3 | COMPOSITE VIDEO / CSYNC | Out | 5-Pin/8-Pin DIN Pin 3: 1.0 Vpp Composite Video Out (EXT Pin B23; or CSYNC on A22) | Yellow RCA / SCART Pin 20 |
| 4 | AUDIO RIGHT (R) | Out | 5-Pin/8-Pin DIN Pin 4: Line-Level Stereo Right Audio Out (EXT Pin C2) | Red RCA / SCART Pin 2 |
| 5 | +5V DC (Sense / Blanking) | Pwr | 5-Pin/8-Pin DIN Pin 5: +5.0 V DC Regulated Output (EXT Pin A21/B21) | SCART Pin 16 via 180 Ω resistor |
| 6 (EXT A23) | ANALOG RED (R — EXT A23) | Out | 8-Pin DIN Pin 6 (or EXT Bus Pin A23): Buffered HuC6260 Pin 40 Red Video | SCART Pin 15 (via THS7374 + 75 Ω + 220 µF) |
| 7 (EXT B22) | ANALOG GREEN (G — EXT B22) | Out | 8-Pin DIN Pin 7 (or EXT Bus Pin B22): Buffered HuC6260 Pin 38 Green Video | SCART Pin 11 (via THS7374 + 75 Ω + 220 µF) |
| 8 (EXT C23) | ANALOG BLUE (B — EXT C23) | Out | 8-Pin DIN Pin 8 (or EXT Bus Pin C23): Buffered HuC6260 Pin 39 Blue Video | SCART Pin 7 (via THS7374 + 75 Ω + 220 µF) |
No-Solder EXT Bus RGB vs Internal THS7374 DIN-8 Upgrade
While the original 1987 white Japanese PC Engine (HTG-001) and North American TurboGrafx-16 (HES-TGX-01) only had an RF coaxial jack on the side/back, both consoles routed Composite Video, Stereo Audio, and unbuffered HuC6260 Analog Red, Green, Blue, and Composite Sync directly to the rear 69-pin (3×23) Expansion Bus! Later models (CoreGrafx, CoreGrafx II, SuperGrafx, PC Engine Duo/Duo-R/Duo-RX) added a 5-pin 180° DIN A/V socket carrying Composite Video and Stereo Audio (frequently upgraded by modders to an 8-pin 262° DIN for amplified RGB).
- Why You Must Buffer HuC6260 RGB Signals: Unlike the Sega Genesis or SNES, the Hudson HuC6260 VCE chip outputs unbuffered current-mode RGB on Pins 38 (G), 39 (B), and 40 (R) directly to the rear 69-pin Expansion Bus (Pins B22, C23, A23). Never wire those pins straight to a 75 Ω TV input without a THS7314/THS7374 video amp or 2SC1815 emitter-follower buffer!
- 69-Pin Expansion Bus Pin Summary (White PC Engine & US TurboGrafx-16): Top Row A: Pin A1 = Left Audio, Pin A21 = +5V, Pin A22 = /CSYNC, Pin A23 = Analog Red. Middle Row B: Pin B22 = Analog Green, Pin B23 = Composite Video. Bottom Row C: Pin C1 = GND, Pin C2 = Right Audio, Pin C22 = Video GND, Pin C23 = Analog Blue.