Re: scsi hard disk for IIe

["Allen Bong" <sfbong@tm.net.my>]

Thanks Michael & Phil for all your informations,  I just found one harddisk
that has a matching socket for the address plug but it is only 160MB.  So I
would opt for Phil's advice and strapped the HD id to 4.  I have an iomega
zip drive at 5 and the external 2X CDROM at 3 to be connected once the HD is
working.

Allen


"Phil Abel" <phil_nospam_abel@prodigy.nospam.net> wrote in message
news:x987a.1162$1A1.616@newssvr19.news.prodigy.com...
> I have had problems with internal SCSI ID selectors not fitting in all
> case/drive combinations (or not being long enough to reach if the ID pins
> are on the front).  For those drives, I have just had to put jumpers on
the
> SCSI ID pins themselves and do nothing with the SCSI ID plug.  Once you
get
> your drive working, you probably will not be changing the SCSI ID very
often
> anyway, so it isn't too inconvenient to "hard code" the SCSI ID into the
> drive with jumpers.
>
> You need to use jumpers instead of running the individual wires directly
to
> the SCSI ID selectors.  For example, if you wanted to set SCSI ID = 1, you
> need A0=On,A1=Off,A2=Off.  To turn A0 "on" you need to connect the two A0
> pins together (thus completing a circuit), which the function of the
jumper.
> The SCSI ID switch just scrolls through all the On/Off binary combinations
> to open/close the respective circuits.  Maybe you can find another plug
that
> will fit your drive better, but I don't think you can do it with the wires
> themselves.
>
> Hopefully your Quantum drive or another drive has some spare jumpers on it
> you can cannibalize.  If not, your desktop guy at work should have a
drawer
> full of them and will be more than happy to part with a few.  They are
tiny,
> so don't lose them in the carpet if you drop them!  I tape my extras onto
a
> white piece of paper so they are much harder to lose!
>
> You can view a pin-out of your quantum drive on the internet.  Maxtor
> supports all of quantum's old legacy 50-pin drives now for some reason.  I
> assume quantum sold those assets off to them some time ago.  I assume you
> have a ProDrive/LPS class of Quantum... Go here...
> http://www.maxtor.com/en/support/products/scsi/legacy/index.htm
> ...and you should be able to find the specs on your drive.
>
> > If my drive is terminated internally.  Do I need to put a terminator on
> the
> > other CN50 socket outsoide the enclosure?
>
> I believe a previous reply has mentioned this as well, but I have had
> internally terminated drives hooked up with a CN50 terminator on the end
and
> with no problems.  I can never remember which ones are internally
terminated
> anyway, so doing this just covers everything.  If nothing else, it helps
> protect the socket from corrosion, dust, etc. and keeps me from hitting
and
> bending the clasps on the sides of the socket whenever I move the case
> around.
>
> "Allen Bong" <sfbong@tm.net.my> wrote in message
> news:3e5c10ed$1_2@news.tm.net.my...
> > Hi,
> >
> > I bought a scsi enclosure (cheap) and mounted my 700MB Quantum drive
into
> > it.  From the back of the enclosure there is a 5-pin plug with 4 wires
on
> it
> > which I can't find a place to plug in on my HD.  It  is for the address
> > selection switch connected to a thumbwheel switch with 2 buttons on it.
> >
> > Anyone know how I am going to connect this cable.  Can I just solder the
> > wires to the 6-pin jumper block A0,A1,A2  directly and anyone know which
> > wire goes to where?
> >
> > If my drive is terminated internally.  Do I need to put a terminator on
> the
> > other CN50 socket outsoide the enclosure?
> >
> >
> > Allen
> >
> > --
> > The next war will determine NOT who is right  BUT what is left.
> >
> >
> >
>
>