Chapter 2
Connecting Ultra SCSI
The E100’s Ultra SCSI feature is designed for ease of use. When you
start up your SuperMac computer, a series of data-integrity checks
run on the E100 and the devices attached to it.
The E100 card requires the use of single-ended Ultra SCSI devices.
Differential Ultra SCSI devices are incompatible. The E100 card is
backward compatible. It can be connected to any SCSI device that con-
forms to one of the following SCSI standards: SCSI, SCSI-2, or SCSI-3.
The E100 card has a feature called automatic termination, which
detects if and when termination is needed and, when appropriate, sup-
plies termination automatically.
Connecting Device Cables to the E100 Card
The E100 has two SCSI connectors, an external Wide SCSI-3 16-bit
connector and an internal Wide SCSI-3 16-bit connector. Both connec-
tors are 68-pin (female) SCSI-3 connectors. You can connect two SCSI
device cables directly to the E100 card. You can daisy-chain up to 16
devices with proper cabling.
Termination
Terminators, also know as termination resisters, connect to SCSI
devices and cables to make data transfer more reliable. SCSI guide-
lines require terminators on the first and last SCSI devices of each
SCSI bus.
Note: We recommend that you use active terminators. Using non-active
terminators may cause termination problems and data loss.
The E100’s automatic terminator feature means that you should never
have to worry about correct termination on the E100 card itself. Just
make sure that correct termination is attached to the last device at
each end of the device chain.
