C.1.11.1
Keyboard and Mouse Port
The keyboard and mouse are connected to the USB connectors, located on the
motherboard. Keyboard current is limited to 700 milliamperes (mA) by a resettable
fuse.
Keyboard
USB ports
Diskette drive
Mode select
Density sense
FIGURE C-10
C.1.12
Diskette Drive and Parallel Ports
The diskette drive and parallel port are managed by the SuperI/O component.
C.1.12.1
Diskette Port
The diskette port is supported by a diskette controller, located on the SuperI/O
ASIC. The diskette controller is software compatible with the DP8473, DP765A, and
the N82077 diskette controllers. The SuperI/O ASIC is compatible with
perpendicular recording drives (2.88-Mbyte formatted diskettes) and standard
diskette drives. The diskette controller handles data rates of 2Mbit/sec., 1Mbit/sec,
500 Kbits/sec, and 250 Kbit/sec.
C-32
Sun Blade 1000 and Sun Blade 2000 Service Manual • January 2002
Mouse
SuperI/O
PCIO-2
ASIC
EBus
controller
Keyboard and Mouse, Diskette, and Parallel Port Functional Block Diagram
Parallel
port
1
Serial
port
2
Diskette
Parallel port
DB-25
EMI
filter
Diskette drive
edge connector