#Quantum Strangeness
07-Jun-92 10:12:25
Sb: #59170-#Quantum Strangeness
Fm: Jonathan Hirschman 70274,2526
To: Margaret Copeland 76702,1746
Margaret,
Just for your info: the internal resistors on a SCSI drive seem to come in
threes (if there is an exception to this, someone let me know). I have
found this to be true on Quantum, Toshiba and Seagate SCSI devices. They
are usually either black or orange/yellow (in my experience; this is
probably not a good rule of thumb)…when you get a new drive, these packs
*SHOULD* be installed. They are usually in SIP format (single inline (pin)
package). They may even be called "RP1", "RP2" and "RP3" on the logic
board. It is a good idea to remove these immediately if you wish to
terminate things externally.
An external terminator is simply a plug that pops over the last external
SCSI port in your daisy chain; if you only have internal devices, pop it on
the port of the controller card. Most have the 25-pin port, so you would
need a SCSI cable to do so (external terminators usually use a Centronics
port found on external SCSI devices). The Adaptec on the SCSI using PC at
work uses a Centronics port, so it is nice and tidy.
Right now, I have *NO* resistor packs installed on any of my devices,
using only an external terminator. If I add another external device, there
is no need to futz around with internal resistor packs ever again.
Jonathan
– via Whap!