> If that external chain was actually SCSI-2, then it would requireactive terminations - and using passive ones on a long chain would result in bad reflections, manifesting as serious system instabilities. But that's not the case. While I may sometimes be mentally unstable, my 7300s with long chains are rock solid. And my tech docs say the interface is *SCSI-1*.
It's a hardware thing. It is my understanding that any SCSI bus that goes through 1 of those 25-pin connectors that Apple used from the Mac Plus all the way up through the beige G3s, has to be "dumbed down" a bit, & can't do all the things that you can expect of a true SCSI-2 bus, including speed.
Those buses are true SCSI-1. In the normal 50-pin connector, half the pins are ground. Apple chose to go with the 25-pin, eliminating those unnecessary ground pings, as a space & cost saver. That's all.
- Dan.
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