Note
Most of the following information comes from wikipedia&consolemods
1. Main Power Supply Specifications
| Category | Connector Size | Recommended Plug Type | Output | Polarity | Main Compatible Systems |
|---|---|---|---|---|---|
| A | 5.5 × 2.1 mm | Tuning-fork type | DC 9V, recommended 2A | Center negative | Mega Drive 1, Genesis 1, Mega-CD, Sega CD, Master System, SG-1000, PC Engine, Atari Jaguar |
| B | 5.5 × 2.1 mm | Tuning-fork type | DC 10V, recommended 1.5A–2A | Center negative | Famicom, New Famicom, Super Famicom, selected 10V SEGA systems |
| C | 5.5 × 2.5 mm | Straight-barrel / trumpet type | DC 9V, recommended 2A | Center negative | NEC PC Engine CD-ROM² Interface Unit IFU-30 |
| D | EIAJ-03, 4.75 × 1.7 mm | EIAJ standard plug | DC 7.5V 2A | Center positive | PS one |
| E | EIAJ-03, 4.75 × 1.7 mm | EIAJ standard plug | DC 8.5V 5.65A | Center positive | PS2 Slim SCPH-700xx series |
| F | EIAJ-03, 4.75 × 1.7 mm | EIAJ standard plug | DC 10V, at least 850mA | Center positive | Mega Drive 2, Genesis 2, 32X |
| G | Approx. 6.9 × 4.1 mm with internal pin | North American SNES proprietary plug | DC 10V 850mA | Center negative | North American SNES and SNES Jr. |
| H | 5.5 × 2.5 mm | Standard barrel plug | AC 9V, approx. 1.2A | No polarity | PAL NES and PAL SNES |
| I | 5.5 × 2.1 mm | Standard barrel plug | AC 9V, approx. 1.2A | No polarity | North American NES |
The EIAJ-03 plug is approximately 4.75 × 1.7 mm, and is also commonly sold as 4.8 × 1.7 mm.
2. 5.5 × 2.1 mm, Center-Negative Systems
DC 9V Systems
| Brand | Console / Device | Region or Model | Original Output | Polarity | Connector |
|---|---|---|---|---|---|
| Nintendo | Famicom Disk System | HVC-022 | DC 9V 400mA | Center negative | 5.5 × 2.1 mm |
| SEGA | SG-1000 | Japan | DC 9V 850mA | Center negative | 5.5 × 2.1 mm |
| SEGA | SG-1000 II | Japan | DC 9V 850mA | Center negative | 5.5 × 2.1 mm |
| SEGA | SC-3000 / SC-3000H | Selected versions | DC 9V | Center negative | Usually 5.5 × 2.1 mm |
| SEGA | SEGA Mark III | Japan | DC 9V 850mA | Center negative | 5.5 × 2.1 mm |
| SEGA | Master System | Most Model 1 versions | DC 9V 1A | Center negative | 5.5 × 2.1 mm |
| SEGA | Master System MK-2000 | Japan | DC 9V 850mA | Center negative | 5.5 × 2.1 mm |
| SEGA | Mega Drive Model 1 | Japan and selected regions | DC 9V 1.2A | Center negative | 5.5 × 2.1 mm |
| SEGA | Genesis Model 1 | North America | DC 9V 1.2A | Center negative | 5.5 × 2.1 mm |
| SEGA | Mega-CD Model 1 / 2 | Region-dependent | DC 9V, approx. 1.2A | Center negative | 5.5 × 2.1 mm |
| SEGA | Sega CD Model 1 / 2 | North America | DC 9V 1.2A | Center negative | 5.5 × 2.1 mm |
| SEGA | Game Gear | Japanese / European versions | DC 9V, 850mA–1.2A | Center negative | 5.5 × 2.1 mm |
| NEC | PC Engine | Original white Japanese model | DC 9V 650mA | Center negative | 5.5 × 2.1 mm |
| NEC | CoreGrafx I | Japan | DC 9V 650mA | Center negative | 5.5 × 2.1 mm |
| NEC | CoreGrafx II | Japan | DC 9V 650mA | Center negative | 5.5 × 2.1 mm |
| NEC | PC Engine Shuttle | Japan | DC 9V | Center negative | 5.5 × 2.1 mm |
| Atari | Jaguar | North America / Europe | DC 9V 1.2A | Center negative | 5.5 × 2.1 mm |
| Atari | Jaguar CD | North America / Europe | DC 9V 1.2A | Center negative | 5.5 × 2.1 mm |
Recommended modern replacement:
DC 9V 2A, center negative, 5.5 × 2.1 mm tuning-fork plug
DC 10V Systems
| Brand | Console / Device | Region or Model | Original Output | Polarity | Connector |
|---|---|---|---|---|---|
| Nintendo | Famicom | HVC-001 | DC 10V 850mA | Center negative | 5.5 × 2.1 mm |
| Nintendo | New Famicom / AV Famicom | HVC-101 | DC 10V 850mA | Center negative | 5.5 × 2.1 mm |
| Nintendo | Super Famicom | SHVC-001 | DC 10V 850mA | Center negative | 5.5 × 2.1 mm |
| Nintendo | Super Famicom Jr. | SHVC-101 | DC 10V 850mA | Center negative | 5.5 × 2.1 mm |
| SEGA | Mega Drive Model 1 | Selected European versions | DC 10V 1.2A | Center negative | 5.5 × 2.1 mm |
| SEGA | Master System II | Selected European versions | DC 10V 500mA | Center negative | Usually 5.5 × 2.1 mm |
| SEGA | Game Gear | Selected European adapters | DC 10V | Center negative | 5.5 × 2.1 mm |
| SNK | Neo Geo AES | Only compatible 10V PRO-POW3 / PRO-POW-E versions | DC 10V 1A | Center negative | 5.5 × 2.1 mm |
Important: Neo Geo AES systems vary significantly. Some versions require only 5V. Always check the power rating printed on the bottom of the console before connecting a 9V or 10V power supply.
3. 5.5 × 2.5 mm Straight-Barrel, Center-Negative
| Brand | Console / Device | Original Output | Polarity | Connector | Recommended Replacement |
|---|---|---|---|---|---|
| NEC | PC Engine CD-ROM² Interface Unit IFU-30 | DC 9V 1.45A | Center negative | 5.5 × 2.5 mm | Regulated DC 9V 2A |
This specification applies to the IFU-30 Interface Unit, not the standard PC Engine console or the standalone CDR-30 CD-ROM² player.
4. EIAJ-03 / 4.75 × 1.7 mm, Center-Positive
| Brand | Console | Output | Polarity | Connector | Notes |
|---|---|---|---|---|---|
| Sony | PS one | DC 7.5V 2A | Center positive | EIAJ-03, 4.75 × 1.7 mm | Use a dedicated 7.5V adapter |
| Sony | PS2 Slim SCPH-700xx | DC 8.5V 5.65A | Center positive | EIAJ-03, 4.75 × 1.7 mm | Requires a high-current adapter |
| SEGA | Mega Drive 2 / Genesis 2 | DC 10V 850mA | Center positive | EIAJ-03, 4.75 × 1.7 mm | Not suitable for PS one |
| SEGA | Genesis 3 | DC 10V 300mA | Center positive | EIAJ-03, 4.75 × 1.7 mm | Same plug type as MD2 |
| SEGA | 32X | DC 10V 850mA | Center positive | EIAJ-03, 4.75 × 1.7 mm | Uses MD2-type power supply |
| SEGA | Mega Jet | DC 10V 850mA | Center positive | EIAJ-03, 4.75 × 1.7 mm | MD2-type power input |
| SEGA | Genesis Nomad | DC 10V 850mA | Center positive | EIAJ-03, 4.75 × 1.7 mm | MD2-type power input |
| SEGA | Sega Pico | DC 10V 850mA | Center positive | EIAJ-03, 4.75 × 1.7 mm | MD2-type power input |
| SEGA | Game Gear | North American version | DC 10V 850mA | Center positive | EIAJ-03, 4.75 × 1.7 mm |
Although PS one, PS2 Slim SCPH-700xx, and Mega Drive 2 use similar plugs, their voltage and current requirements are different and the power supplies should not be interchanged.
5. North American SNES Proprietary Connector
| Console | Output | Polarity | Connector | Notes |
|---|---|---|---|---|
| North American SNES SNS-001 | DC 10V 850mA | Center negative | Approx. 6.9 × 4.1 mm with internal pin | Nintendo proprietary connector |
| North American SNES Jr. SNS-101 | DC 10V 850mA | Center negative | Same proprietary connector | Not compatible with standard 5.5 × 2.1 mm plugs |
| Selected Korean SNES systems | Model-dependent | Usually center negative | May use a similar connector | Check the console label |
The North American SNES connector is not a standard hollow barrel plug. It uses a proprietary internal-pin design.
6. AC 9V Systems
| Console | Connector | Original Output | Polarity | Notes |
|---|---|---|---|---|
| North American NES | 5.5 × 2.1 mm | AC 9V 1.2A | No polarity | Original power supply is AC |
| PAL NES | 5.5 × 2.5 mm | AC 9V, approx. 1.2A | No polarity | Do not confuse with the IFU-30 DC adapter |
| PAL SNES | 5.5 × 2.5 mm | AC 9V, approx. 1.2A | No polarity | Original system design expects AC input |
A barrel connector that physically fits does not guarantee electrical compatibility.
7. Commonly Confused Systems
| Console | Actual Specification | Commonly Confused With | Risk |
|---|---|---|---|
| Sharp Twin Famicom | 5.5 × 2.5 mm, DC 7.6V, center positive | IFU-30 9V center-negative adapter | Opposite polarity and excessive voltage |
| TurboGrafx-CD Dock | 5.5 × 2.5 mm, DC 11V, center negative | IFU-30 9V adapter | Voltage may be too low for reliable CD operation |
| Neo Geo AES 5V version | 5.5 × 2.1 mm, DC 5V, center negative | Famicom / MD1 9V or 10V adapter | May severely damage the console |
| North American Game Gear | EIAJ-03, center positive | Japanese / European Game Gear 5.5 × 2.1 mm adapter | Different connector and polarity |
| Mega Drive 2 / Genesis 2 | EIAJ-03, center positive | Mega Drive 1 5.5 × 2.1 mm center-negative adapter | Different connector and opposite polarity |
| PS one | EIAJ-03, DC 7.5V center positive | PS2 Slim or MD2 adapter | Excessive voltage may damage the console |
| PS2 Slim SCPH-700xx | EIAJ-03, DC 8.5V 5.65A center positive | PS one or MD2 adapter | Insufficient current and incorrect voltage |
8. Recommended Product Line
| Product Code | Recommended Output | Connector and Polarity | Main Compatible Systems |
|---|---|---|---|
| PSU-A | DC 9V 2A | 5.5 × 2.1 mm tuning-fork, center negative | MD1, Master System, PC Engine, Jaguar, Mega-CD, Sega CD |
| PSU-B | DC 10V 2A | 5.5 × 2.1 mm tuning-fork, center negative | Famicom, New Famicom, Super Famicom |
| PSU-C | DC 9V 2A | 5.5 × 2.5 mm straight-barrel, center negative | NEC IFU-30 |
| PSU-D | DC 7.5V 2A | EIAJ-03, center positive | PS one |
| PSU-E | DC 8.5V 5.65A | EIAJ-03, center positive | PS2 Slim SCPH-700xx |
| PSU-F | DC 10V 1A or higher | EIAJ-03, center positive | Mega Drive 2, Genesis 2, 32X |
These power supplies should not be combined into one universal model by changing only the connector, because the required voltage and polarity are different.