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
Total Pins
24 Pins (Row A1–A12 Top; Row B12–B1 Bottom in reversed rotational symmetry)
5V Sink Pull-Down
Two separate 5.1 kΩ (±1%) resistors: one from A5 (CC1) to GND, one from B5 (CC2) to GND
9V / 12V PD Trigger
Use a ZY12PDN / CH224K PD decoy module set to 9V (for ZX Spectrum/C16) or 12V!
Full Pin Assignment & Wiring Reference
| Pin | Signal Name | Direction | Electrical Spec / Role | Wire Colour / SCART / Adapter Target |
|---|---|---|---|---|
| A1 / B12 | GND | GND | 0 V Ground Return (Outer corner pins) | Black |
| A2 / A3 | TX1+ / TX1- | Out | SuperSpeed USB 3.x Differential Transmit Pair 1 | Green / White |
| A4 / B9 | VBUS | Pwr | +5 V Default Bus Power (or 9 V / 12 V / 15 V / 20 V negotiated via USB-PD) | Red (+5V–20V) |
| A5 | CC1 | I/O | Configuration Channel 1 (Requires 5.1 kΩ pull-down to GND for 5V Sink!) | White / Yellow |
| B5 | CC2 | I/O | Configuration Channel 2 (Requires its own 5.1 kΩ pull-down to GND!) | Blue |
| A6 / B6 | D+ (USB2) | I/O | USB 2.0 Differential Data+ (480 Mbps) | Green |
| A7 / B7 | D- (USB2) | I/O | USB 2.0 Differential Data- (480 Mbps) | White |
| A8 / B8 | SBU1 / SBU2 | I/O | Sideband Use (DisplayPort Alt-Mode AUX / Audio) | Orange |
| A10 / A11 | RX2- / RX2+ | In | SuperSpeed USB 3.x Differential Receive Pair 2 | Purple |
| A12 / B1 | GND | GND | 0 V Ground Return (Outer corner pins) | Black |
Using USB-C PD Trigger Boards (9V / 12V / 5V) in Retro Computers
The reversible 24-pin USB Type-C connector duplicates GND, VBUS, and D+/D- across Row A (A1–A12) and Row B (B12–B1), while using CC1 (A5) and CC2 (B5) to detect cable orientation and negotiate USB Power Delivery (5 V, 9 V, 12 V, 15 V, 20 V).
- For 5V-Only Retro Systems (Atari 800XL/130XE, Amstrad CPC 464): Use a 6-pin USB-C receptacle with two 5.1 kΩ resistors on CC1 and CC2 to request 5.0 V @ up to 3.0 A from any USB-C charger.
- For 9V DC Systems (ZX Spectrum 48K/128K, Commodore 16/116): Use a CH224K 9 V USB-C PD trigger module so the USB-C charger outputs regulated 9.0 V DC (eliminating the heavy linear wall wart!).