Supported Target Devices; External Cables; Superi/O - Sun Microsystems Sun Blade 1000 Service Manual

The UltraSCSI electrical characteristics for the host adapter and target device
include:
V
il
V
ih
I
il
I
ih
Minimum input hysteresis equals 0.3 VDC
C.1.17.2

Supported Target Devices

The SCSI subsystem supports a maximum of three internal devices, including the
host adapter, DVD-ROM drive and tape drive. The external SCSI bus supports up to
16 Ultra Wide SCSI devices.
C.1.17.3

External Cables

External UltraSCSI-compliant SCSI cables have an impedance of 90 ohm (+/- 6
ohms) and are required for UltraSCSI interface. The Sun implementation of
UltraSCSI requires that the total SCSI bus length be limited to no more than
approximately 20 feet (6 meters) with up to 12 Sun compensated devices.
Due to the considerably short bus length, two UltraSCSI-compliant external cables
are supported: a 32-inch (0.8-meter) and a 6.5-feet (2-meter).
Note – Consult your authorized Sun sales representative or service provider to
order UltraSCSI-compliant external cables.
There is also an external SCSI connector on the backpanel for legacy peripheral
devices.
C.1.18

SuperI/O

The Sun Blade 1000 and Sun Blade 2000 workstations use a SuperI/O ASIC to
interface to the diskette drive and the parallel port. The SuperI/O ASIC also:
provides the TOD/ID SEEPROM and interfaces with the power supply.
C-42 Sun Blade 1000 and Sun Blade 2000 Service Manual • January 2002
(input low) equals 1.0 VDC maximum (signal true)
(input high) equals 1.9 VDC minimum (signal false)
(input low current) equals +/- 20 µA at V
(input high current) equals +/- 20 µA at V
equals 0.5 VDC
i
equals 2.7 VDC
i