Original late-model NEC hardware AC adapters are very difficult to find, and when you do find them they can be quite expensive. Most universal DC adapters do not come with a plug that fits the unusually sized NEC DC jack.
With this DC plug, you can make your own adapter, or repair a bad connection on an existing NEC power adapter.
NEC Turbo Duo
NEC Super Grafx
NEC Super CD-ROM2
This plug will correctly work with a Super CD-ROM2 connected via Super Grafx if you have the jumper lead and wish to convert to a single power supply.
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