Interactive Connector Diagram
Click or tap any pin in the diagram below to inspect its signal assignment, electrical specification, and wire colour standard.
Click any pin to view its signal assignment, electrical spec, and wire colour.
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
Connector Standard
DIN 45322 (6-Pin 240° Circular, no center pin)
Amstrad CPC Levels
3-Level Ternary R, G, B (~0V / 0.35V / 0.7V, 27 colours) + Composite Sync (Pin 4) + Luma (Pin 6)
5V / 12V Pass-Through
No DC power on CPC 6-pin DIN! CTM640/GT64 monitor supplies +5V DC via separate 2.1mm barrel lead (+12V lead on 664/6128); tap inline +5V for SCART Pin 16
BBC Micro Levels
5 V TTL Digital R, G, B (8 colours) + CSYNC (Pin 4) + +5 V Out (Pin 6)
SCART Blanking
BBC Micro uses Pin 6 (+5 V via 180 Ω); CPC uses inline +5 V DC barrel pass-through (via 180 Ω to SCART Pin 16) or USB +5 V
Full Pin Assignment & Wiring Reference
| Pin | Signal Name | Direction | Electrical Spec / Role | Wire Colour / SCART / Adapter Target |
|---|---|---|---|---|
| 1 | RED | Out | Amstrad CPC: Analog Red (~0.7 Vpp via internal 3-state divider) | BBC Micro: Red (5V TTL) | SCART Pin 15 (via 270–330 Ω on BBC; direct/100 Ω on CPC) |
| 2 | GREEN | Out | Amstrad CPC: Analog Green (~0.7 Vpp, determines GT64 green shade) | BBC Micro: Green (TTL) | SCART Pin 11 (via 270–330 Ω on BBC; direct/100 Ω on CPC) |
| 3 | BLUE | Out | Amstrad CPC: Analog Blue (~0.7 Vpp via internal 3-state divider) | BBC Micro: Blue (TTL) | SCART Pin 7 (via 270–330 Ω on BBC; direct/100 Ω on CPC) |
| 4 | /CSYNC (Composite Sync) | Out | Amstrad CPC: 15.625 kHz / 50 Hz Composite Sync | BBC Micro: /CSYNC (5V TTL) | SCART Pin 20 (via 330–470 Ω series resistor) |
| 5 | GND (0 V Shield) | GND | Common Video & Sync Ground Return on BOTH Amstrad CPC and BBC Micro | SCART Pins 5, 9, 13, 17, 18, 21 (GND) |
| 6 | CPC: LUMA | BBC: +5V DC | Out | Amstrad CPC: Composite Luminance (for GT64/GT65 green monitor) | BBC Micro: +5 V DC Out! | BBC: SCART Pin 16 via 180 Ω | CPC: Leave NC in RGB SCART |
Amstrad CPC vs. BBC Micro RGB SCART Cable Resistor & +5V/+12V Pass-Through Guide
Both the Amstrad CPC family (CPC 464, 664, 6128) and the Acorn family (BBC Micro Model B, B+, Master 128, and Acorn Electron) use a 6-pin 240° circular DIN socket (DIN 45322) for RGB output, but with different pin mappings and voltage levels: the Amstrad Gate Array outputs 3-state ternary (Low/Mid/High) RGB for 27 colours, while the BBC Micro Video ULA outputs 5 V TTL digital RGB.
- BBC Micro / Acorn Electron RGB SCART Cable: Put a 270 Ω to 330 Ω resistor in series with Pin 1 (Red -> SCART 15), Pin 2 (Green -> SCART 11), and Pin 3 (Blue -> SCART 7) to drop 5 V TTL to 0.7 Vpp. Put a 470 Ω resistor in series with Pin 4 (CSYNC -> SCART 20), and wire Pin 6 (+5 V) through a 180 Ω resistor to SCART Pin 16 (RGB blanking).
- Amstrad CPC 464 / 6128 RGB SCART Cable: Because the CPC already has internal series resistors on R, G, B, wire Pins 1, 2, 3 directly (or via 100 Ω protection resistors) to SCART Pins 15, 11, 7, and wire Pin 4 (/SYNC) via a 330 Ω–470 Ω resistor to SCART Pin 20. Leave DIN Pin 6 (Luminance) disconnected for RGB SCART!
- Amstrad CPC +5V / +12V Pass-Through & SCART Pin 16 Blanking: Unlike the BBC Micro, the CPC 6-pin DIN carries NO +5V or +12V rail (the original CTM640/GT64 monitor sent +5V DC to the CPC via a separate captive 2.1mm barrel lead, plus a 3.5mm +12V lead for the 664/6128 disk drive). To auto-switch a SCART TV into RGB mode, feed +5V from an inline 2.1mm DC pass-through tee (or USB plug) through a 180 Ω resistor into SCART Pin 16 (produces ~1.5V across 75 Ω), and optionally feed +5V/+12V to SCART Pin 8. Wire a 3.5 mm stereo jack plug from the CPC's side STEREO socket into SCART Pins 6 (Left), 2 (Right), and 4 (Audio GND).