Sun Microsystems 60 service manual Table C-7Supported Target Devices

TABLE C-7

The Fast-20 electrical characteristics for the host adapter and target device include:

■Vil (input low) equals 1.0 Vdc maximum (signal true)

■Vih (input high) equals 1.9 Vdc minimum (signal false)

■Iil (input low current) equals +/- 20 μA at Vi equals 0.5 Vdc

■Iih (input high current) equals +/- 20 μA at Vi equals 2.7 Vdc

■Minimum input hysteresis equals 0.3 Vdc

C.1.14.2 Supported Target Devices

The SCSI subsystem supports a maximum of four internal devices, including the host adapter. The CD-ROM drive is a narrow device. A unipack with one drive or a

six-pack, accommodating six drives, can be used as external devices. lists the target devices supported by the SCSI subsystem.

TABLE C-7Supported Target Devices

Target Device	Comment
Internal disks	Up to two 3.5-inch x 1.6-inch disks (4.2-, or
	9.1-Gbyte). All internal disks are
	UltraSCSI-compliant.
Internal CD-ROM drive	Optional 644-Mbyte SunCD 12X speed;
	photo CD compatible. Headphone jack with
	volume control. CD-ROM drive is a narrow
	SCSI device.
Internal tape drive(s)	Refer to product guide.
External SPARCstorage UniPack	Refer to product guide.
External SPARCstorage SixPack	Refer to product guide.

C.1.14.3 External Cables

External UltraSCSI-compliant SCSI cables have an impedance of 90 ohm (+/- 6 ohm) and are required for UltraSCSI interface. Sun’s 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, an approximate 32-inch (0.8-meter) UltraSCSI-compliant external cable is supported in addition to an approximate 6.5-foot (2-meter) UltraSCSI-compliant external cable.

Note –Consult your authorized Sun sales representative or service provider to order a 0.8-meter or a 2-meter UltraSCSI-compliant external cable.

Appendix C Functional Description C-31