Hello Thierry, "-V" is nothing more as the negative connection. If you use it for a negative Voltage, like in the S-100 world, you have to connect "+V" to "GND". http://www.schukat.com/schukat%5Cpdf.nsf/index/7ED2453B9CE6872BC1257299004110DA/$file/RS-75-spec.pdf
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