# How to make a SCSI-3 terminator?

I have an old VAXstation that has an external SCSI Bus.

When I don't have anything attached to that, I get errors. I was thinking of adding a terminator, but those that I found online are quite expensive. So I was thinking of wiring one myself.

Does anybody happen to know how I should wire them, and what resistors I need?

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Active termination means that there is a small voltage regulator which provides a +3.3 V supply. Each signal line is then terminated by a $110\Omega$ resistor to the +3.3 V supply. Active termination provides a better impedance match than passive termination because most flat ribbon cables have a characteristic impedance of approximately $110\Omega$.