Interface unit power dead...

[mickcris]

I assume it is broken in the middle somewhere.  I would think the  wires would be 2 different colors. Probably a red and a black wire

And yeah, you can also just twist them back together and cover with electrical tape in a pinch. 

If the wires aren't different colors, can just hook them up one way and measure the output to see if it's center negative or positive.  If incorrect, then switch wires

[Ex_Mosquito]

A word of warning. I used a 9v 1200a PSU and the IFU powered on and played HuCards but the CD drive would be VERY temprimental loading a CD, it was if it was having trouble reading the disk, I originally thought my CD drive was in its way out. Anyway, I tried a different PSU with 9v 1750a and the CD drive loads a CD every time.

[GohanX]

If it's the same as the CoreGrafx/PC Engine (which I think it is) you could just use a Genesis Model 1/SegaCD power supply.  The 1602 is the model I'm talking about.

My genesis power adapter only dose 500 Ma, dont I need closer to 1400Ma?

If it's a model 2 Genesis you may be ok, they use very little power. Model 1s use significantly more.

[Hippokittie]

Would this work?

 https://www.walmart.com/ip/40-Watt-40W-Universal-Mini-Laptop-Netbook-Notebook-AC-Adapter-Power-Cord-Automatic-Voltage-Adjustment-9-5V-12V-18-5V-19V-20V-5-Tips-Kentek/118781270

Also, the concern was the dog...ate the connector...so no rewiring. The Genesis I have is an off brand (non Sega) hence the 500ma.

or would this be better? http://www.frys.com/product/8030414?site=sr:SEARCH:MAIN_RSLT_PG

[spenoza]

The second doesn't appear to have adequate amperage. I cannot determine polarity easily for the first.

You need a 9 volt power adapter that can push at least 1.5A (1500ma) and has a center-negative (sometimes just called negative or negative tip) 5.5mm x 2.5mm plug.

These would all be sufficient:

https://www.amazon.com/OMNIHIL-Adapter-Negative-OMH-120-0920U-100-240V/dp/B013KYYNUA/

https://www.amazon.com/Zawdio-Power-Supply-Adapter-Negative/dp/B01H0ZAXYU/