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12. Blackcat


A Blackcat cable is the interface you'll need if you plan on modifying a Motorola SB5100 below are the schematics for making a Blackcat.


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12a. SN74LS244N Version


12b. Chipless version

And here's an alternative that doesn't require a chip or resistors. There has been some talk of frying your modem using this method but I've tried this myself on a SB4100 and a SB5100 and it worked fine on both modems.