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| Device | Connector | Volt | Power | Polarity |
| Acorn | ||||
| Acorn Atom – Unexpanded with non bridged regulators | 5×2.5 mm DC jack | 8-10V | 1.8A | positive center |
| Acorn Atom – Expanded with bridged regulators | 5×2.5 mm DC jack | 5V | 3A | positive center |
| Sega | ||||
| Sega Game Gear | 5.5mm x 2.1mm / 2.5mm | 9V | 3W | Negative Center |