🚀 go-pugleaf

Sean Sharkey <sean@g0oanint.demon.co.uk> wrote:

> ric <btgsch@rmplc.co.uk> wrote:
> 
> > BTW, do you know what the termination rules are for HDs on a Plus, I'm
> > getting nowhere getting mine to recognise SCSI devices at the minute.
> 
> 
> To cut a very long story short the SCSI spec states that the
> host device (Computer) must provide a +5v line on the SCSI
> connections to supply the terminator resistors. 

Hang on - that can't be right.  Termination resistors don't need any
power at all.  They connect from the signal lines to a 0V line.

> Guess what, the Mac plus doesn't supply this voltage
> so even if you use plug terminators your SCSI chain
> still can't figure out that anything is connected to it.

I'm using a plug terminator on the end of my Mac Plus's SCSI chain and
it works perfectly happily.

> If you are handy with a soldering iron and feel happy
> messing about inside you gear let me know and I'll
> talk you through what to do.

Hmm...  But you do seem to know what you're talking about - can you be
more explicit about what's going on?

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