Diskette Drive - Sun Microsystems Ultra 80 Service Manual

C.1.7.2

Diskette Drive

The system uses a standard 1.44-Mbyte diskette drive that is 1 inch (25.40 mm) high.
Refer to the Manual Eject Diskette Drive Specifications, part number 805-1133, for
diskette information, panel descriptions, and drive specifications.
Note – The diskette drive is factory set to target address 0. Refer to the Manual Eject
Diskette Drive Specifications, part number 805-1133, to change the target address.
SuperIO Diskette Drive Interface
The SuperIO component contains an onboard diskette drive controller. There is a
16-byte first-in-first-out (FIFO) device that buffers and supports burst and non-burst
modes. The diskette drive controller handles data rates of 500 Kbps and 250 Kbps.
Supported Features
Two additional pins on the PCIO ASIC combine with the SuperIO diskette drive
interface to support all standard Sun diskette drives. This includes
Density_Select-type diskette drives, Density_Sense-type diskette drives, and diskette
drives that use a Disk_Change signal.
Diskette Drive Connectors
Power is supplied to the diskette drive from a cable connecting from the
motherboard to the peripheral assembly. The diskette drive operates from a 5-VDC
supply and uses a maximum power of 1.1 watts during operation. A maximum of 44
milliwatts is used during standby mode. The diskette drive is connected to the SCSI
backplane with a 34-pin ribbon cable. The maximum cable length is 1.6 yards (1.5
meters). From the SCSI backplane, the diskette drive is cabled to the motherboard
with the SCSI connections.
-18 Sun Ultra 80 Service Manual • March 2000