Unexpected floppy behavior...

Bill Sudbrink wh.sudbrink at verizon.net
Mon Mar 21 06:21:05 CST 2005


Pete Turnbull wrote:
> 
> On Mar 20 2005, 19:20, Bill Sudbrink wrote:
> 
> > After a good bit of
> > trying to figure out what was wrong, I discovered that the
> > +5 volt pin in the power connector I was using for the #2 (B)
> > drive had pushed out of the nylon plug so that the drive was
> > unpowered.  Having either of the drives unpowered on the cable
> > caused the other drive to screw up.  The two drives cooperate
> > just fine when both have power.  I don't remember ever seeing
> > this kind of problem before... I seem to remember having unpowered
> > drives hanging off of cables with no ill effects.  I guess that
> > some of the signals (write gate for instance) must be getting
> > pulled low by the unpowered unit.  Is this normal floppy
> > behavior and I'm just remembering wrong?
> 
> Usually that's OK.  Is perhaps the one without power also the one with
> the terminators, or do neither have terminators?
> 

Ah, yes, in each of my tests, the unpowered drive was set for
DS2 (drive B) and TM (termination) and was at the end of the
cable.  But, I thought that the termination was to ground?



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