[ LEGACY AND PROPRIETARY OEM SUPPLIES // IDENTIFIED UNIT ]
Commodore Amiga 500 external PSU 312503-03
Exact model record for Commodore identifier 312503-03. Published ratings below are a model-family reference, not a substitute for the individual unit’s rating label and revision documentation.
SAFETY: Never open a PSU or probe its interior. Dangerous voltage can remain after unplugging; if damaged, wet, noisy, burned, or unstable, disconnect it and replace it with a verified compatible unit. For server hot-plug models, use only the host service procedure and confirm redundancy before removal.
Recorded model specifications
| Exact catalog identifier | Commodore 312503-03. Match all suffixes, assembly and revision markings on the actual label. |
|---|---|
| Form / rated output | Proprietary external low-voltage supply/brick; manufacturer-rated total continuous output class: 25 W. Peak/transient capacity, temperature derating, and combined-rail limits remain specification-revision dependent. |
| AC input rating | 120 V AC, 60 Hz for North American supply variant. Region, temperature, and load may change the nameplate current; use the unit's own label for installation. |
| DC rail reference | Main +12 V output: 0.5 A (25 W class). +3.3 V / +5 V: +5 V DC 2.5 A, +12 V DC 0.5 A, −12 V DC 0.1 A (variant-specific limits). Actual combined limits and auxiliary/standby outputs must be checked on the model-specific output table. |
| Connectors / system interface | 5-pin Amiga power connector; pinout and polarity are essential; not an ATX output. |
| Mechanical envelope | N/A — external brick; verify case label mm (width × height × depth where applicable). Check manufacturer's mounting drawing, screw locations, grille/fan clearance, cable bend radius, and chassis tolerances; never use nominal dimensions alone to force-fit a unit. |
| Standards / revision caveat | No ATX mechanical standard; 312503 family has regional and electrical variants. Connector standards, efficiency certification, and mechanical form factor are different things. ATX, ATX12V, SFX, TFX, Flex ATX, and OEM interfaces are not interchangeable merely because they fit. |
Replacement & compatibility
- Read exact manufacturer model/SKU, DC output table, AC input, hardware revision, date code, and applicable service manual from the physical unit. The same family name can cover materially different revisions.
- For ATX-family units, confirm motherboard/EPS/PCIe connector count and pinout, total and per-rail limits, chassis size, clearances, and GPU transient/cable requirements. For proprietary OEM units, match the exact machine type, FRU/assembly number, keyed connector and service documentation.
- Use only modular cables explicitly qualified for this exact PSU model and revision. Modular PSU-side pinouts are not standardized; never transfer cables from a different supply based only on physical fit.
- Never use an unverified pin adapter to bridge proprietary pinouts. Replacing a PSU cannot correct a damaged motherboard, shorted load, or unsuitable mains circuit.
Revision and documentation notes
Check brick label, AC region, connector pinout and polarity. Do not substitute by plug fit or assume all 312503-xx variants match. Ratings shown are the source-backed nominal model reference; manufacturer documentation can change with regional SKU, revision, certification listing, or replacement part. Confirm all figures against the exact source manual and the PSU label before purchasing or servicing. AC/DC figures on this archive do not describe internal topology or guarantee used-unit condition.
Sources & further reading
- Manufacturer or model reference: Commodore Amiga 500 external PSU 312503-03 (312503-03)Primary product/manual listing for the named model; verify that its exact suffix matches this record and the unit label.
- Intel ATX desktop power supply design guide (where ATX applies)Standards context only; does not certify this SKU or apply to proprietary server/legacy interfaces.
- Corsair modular-cable compatibility chart (illustrative; use the named PSU maker’s exact list)Illustrates manufacturer-specific PSU cable rules; use the named PSU brand's exact compatibility list.
Specifications here are not a substitute for the manufacturer’s model-specific manual, label, chassis service guide, or electrical safety regulations. Where a generic family webpage conflicts with the exact unit label/manual, the label and specific manual control.