🚀 go-pugleaf

I missed the original post.

Richard RUDEK wrote:
> 
> agreen@wumpus.its.uow.edu.au (Anthony Green) wrote:
> 
> >Hello all,
> 
> >I have a PCI scsi card and an external scsi tape drive.
> 
> >I want to add 2 scsi hard drives to my scsi chain but i dont have any
> >more room internally in my putah. So, i was thinking of getting a
> >minitower and putting the 2 scsi hd's in there to start with and connect
> >the mintower to the scsi external port on my scsi card.
> 
> >Now the scsi hard drives dont come with any cables.. so i'll need power
> >cables etc. but i dont have any idea on what scsi cables i'll need both
> >internally in the minitower and also on how to connect the external tape
> >drive to the chain =)
> 
> >I have looked around at the external scsi boxes, but them seem expensive,
> >prices would be appreciated though. In configurations of 2 scsi devices and
> >upwards.
> 
> >I want to try and use a minitower to do it though, and if its possible this
> >would be the preferred option =)
> 

I have 2 SCSI hard drives in an external full tower, connected to a mid tower which
has an Adaptec 1542CF adapter plus other SCSI peripherals.

The adapter is in the middle of the chain, and does not terminate the bus.
Termination comes from a disk drive at one end (in the full tower), and a CROM drive
at the other end (in the mid tower).

The chain is connected by a single "internal" cable that I assembled myself
(bought the IDC 50-way connectors and 50-way ribbon cable at an electronics shop).
It's about two metres long, with about 0.6 metres used inside the mid tower.

If you can, use twisted ribbon cable instead (I'm still looking for a cheap
source). The twisted ribbon cable has a impedance of about 120 ohms, which is
near-ideal for single-ended SCSI.

Single-ended ribbon cable will have an impedance of about half that (~ 60 ohms),
due to the alternating ground connections on the SCSI bus. Avoid this if you can.
It works for me (it's been rock-solid for two years), but your milage may vary.
Be warned.

Carl.