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 Type
5-Pin Square DIN (4 corner pins + 1 center pin 3)
Amiga Rails
Pin 1 = +5V DC (4.5A), Pin 2 = Shield, Pin 3 = +12V DC (1A), Pin 4 = GND, Pin 5 = -12V DC (0.1A)
Flat C128 Rails
Pin 1 = +5V DC (4.3A), Pin 2 = GND, Pin 3 = NC/Shield, Pin 4 = 9V AC, Pin 5 = 9V AC
Full Pin Assignment & Wiring Reference
| Pin | Signal Name | Direction | Electrical Spec / Role | Wire Colour / SCART / Adapter Target |
|---|---|---|---|---|
| 1 | AMIGA: +5V DC | C128: +5V DC | Pwr | Regulated +5.0 V DC Main Logic Rail on BOTH Amiga and C128 | Red (+5V DC) |
| 2 | AMIGA: SHIELD | C128: GND (0V) | GND | Amiga: Chassis Shield Ground | C128: Primary 0 V DC Digital Return! | Black / Bare Braid |
| 3 (Center) | AMIGA: +12V DC | C128: SHIELD/NC | Pwr | Amiga: +12.0 V DC (Disk/Op-Amp) | C128: Shield / Unconnected! | Amiga: Yellow/Brown (+12V) |
| 4 | AMIGA: GND (0V) | C128: 9V AC (1) | Pwr/GND | Amiga: Primary 0 V DC Return! | C128: 9.0 V AC Winding Leg 1! | Amiga: Black | C128: Yellow |
| 5 | AMIGA: -12V DC | C128: 9V AC (2) | Pwr | Amiga: -12.0 V DC (Paula Audio Op-Amp & RS-232) | C128: 9.0 V AC Leg 2! | Amiga: White/Blue (-12V) |
Converting a Modern Mean Well Dual/Triple PSU for C128 or Amiga
Commodore reused the heavy-duty 5-pin Square DIN power connector (originally introduced on the 1985 Commodore 128) on the Amiga 500, A500+, A600, and A1200 — but completely changed the voltages on Pins 2, 3, 4, and 5! Always check the embossed label on the brick before connecting.
- Amiga 500 / 600 / 1200 Bench PSU (e.g. Mean Well RT-50B /RT-65B): Wire +5 V to Pin 1, COM (0 V) to Pin 4, +12 V to Center Pin 3, -12 V to Pin 5, and Chassis Earth/Shield to Pin 2. Note: if -12 V (Pin 5) is missing on an Amiga, Paula's LF347 audio filter op-amp clips and distorts heavily!
- Flat Commodore 128 Bench PSU: Wire +5 V DC (min 3 A) to Pin 1, 0 V DC Ground to Pin 2, and an isolated 9 V AC (1 A) transformer secondary to Pins 4 and 5.