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
CPC 464 / 6128 +5V
5.5×2.1mm Barrel Plug — REGULATED +5.0 V DC @ 2.0 A, CENTRE-POSITIVE (Tip = +5V!)
CPC 664 / 6128 +12V
3.5mm Mono Mini-Jack — REGULATED +12.0 V DC @ 1.0 A, TIP-POSITIVE (Tip = +12V!)
Spectrum +2A / +3
6-Pin 240° Circular DIN (+5V, +12V, -12V, GND — NOT compatible with RGB cables!)
Full Pin Assignment & Wiring Reference
| Pin | Signal Name | Direction | Electrical Spec / Role | Wire Colour / SCART / Adapter Target |
|---|---|---|---|---|
| CPC 2.1mm Barrel TIP | +5.0V DC REGULATED | Pwr | CPC 464/664/6128 Main Logic Supply (MUST be regulated 4.90–5.15 V DC!) | Red (Center Tip = +5V) |
| CPC 2.1mm Barrel SLEEVE | GND (0 V) | GND | CPC 0 V Digital Ground Return | Black (Outer Barrel = GND) |
| CPC 6128 3.5mm Jack TIP | +12.0V DC DRIVE | Pwr | CPC 664/6128 3-Inch Disc Drive Motor Supply (Tip = +12 V DC) | Yellow (Tip = +12V) |
| CPC 6128 3.5mm Jack SLEEVE | GND (0 V) | GND | CPC 664/6128 Disc Drive Ground Return (Sleeve = 0 V) | Black (Sleeve = GND) |
| Spec +2A/+3 DIN Pin 1 & 4 | +5.0V DC | Pwr | ZX Spectrum +2A/+2B/+3 Regulated +5 V DC Input (Pins 1 & 4 tied) | Red (+5V DC) |
| Spec +2A/+3 DIN Pin 2 & 5 | GND (0 V) | GND | ZX Spectrum +2A/+2B/+3 0 V Ground Return (Pins 2 & 5 tied) | Black (GND) |
| Spec +2A/+3 DIN Pin 3 | +12.0V DC | Pwr | ZX Spectrum +2A/+2B/+3 +12 V DC Input (3" Disc Motor & RGB Blanking) | Yellow (+12V DC) |
| Spec +2A/+3 DIN Pin 6 | -12.0V DC | Pwr | ZX Spectrum +2A/+2B/+3 -12 V DC Input (RS-232) | Blue (-12V DC) |
Powering an Amstrad CPC 464 or 6128 Without the Original Monitor
Originally powered from the CTM640/GT65 monitor via captive flying leads, the Amstrad CPC 464 requires a single regulated +5.0 V DC (1.5–2.0 A, Centre-Positive) barrel plug, while the disk-equipped CPC 664 and CPC 6128 require a second lead with a 3.5 mm mono mini-jack (Tip = +12.0 V DC, Sleeve = GND) to power the internal 3-inch floppy drive motor. Meanwhile, the Amstrad-built ZX Spectrum +2A, +2B, and +3 use a 6-pin circular DIN power socket.
- Powering a CPC 464 from USB / 5V PSU: Because the CPC 464 only needs +5.0 V DC (Centre-Positive, ~1.2 A), a high-quality USB-to-5.5x2.1mm centre-positive cable plugged into a 5.0 V 2.4 A USB wall adapter runs a CPC 464 cleanly!
- Powering a CPC 6128 + Gotek from a Dual +5V/+12V Arcade/Mean Well PSU: Wire +5.0 V and GND to the 5.5x2.1mm barrel plug (Power In), and wire +12.0 V (Tip) and GND (Sleeve) to the 3.5mm mono mini-jack (12V DC) so the internal 3-inch disc drive motor spins.