HP Workstation x1000 hp workstation x1000 - technical reference guide - Page 66

the super i/o controller

Page 66 highlights

system board the input/output controller hub 2 (82801BA) the super i/o controller The Super I/O controller provides control for two FDD devices, two serial ports, one bidirectional multimode parallel port, and a keyboard and mouse controller. serial/parallel communications ports The 9-pin serial ports (whose pin layouts are depicted in the chapter "hardware components") support RS-232-C and are buffered by 16550A UARTs, with 16-byte FIFOs. You can program them as COM1, COM2, COM3, COM4, or you can disable them. The 25-pin parallel port (also depicted in the chapter "hardware components") is Centronics compatible, supporting IEEE 1284. You can program the port as LPT1, LPT2, or you can disable it. It can operate in the following modes: • Standard mode (PC/XT, PC/AT, and PS/2 compatible). • Bidirectional mode (PC/XT, PC/AT, and PS/2 compatible). • Enhanced mode (enhanced parallel port, EPP, compatible). • High-speed mode (MS/HP extended capabilities port, ECP, compatible). FDC The integrated flexible disk controller (FDC) supports any combination of two of the following: tape drives, 3.5-inch flexible disk drives, 5.25-inch flexible disk drives. It is software- and register-compatible with the 82077AA, and IBM-compatible. It has an A and B drive-swapping capability and a non-burst DMA option. keyboard and mouse controller The computer has an 8042-based keyboard and mouse controller. See the chapter "hardware components" for connector pin layouts. 66 Chapter 2

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system board
the input/output controller hub 2 (82801BA)
Chapter 2
66
the super i/o controller
The Super I/O controller provides control for two FDD devices, two serial
ports, one bidirectional multimode parallel port, and a keyboard and
mouse controller.
serial/parallel communications ports
The 9-pin serial ports (whose pin layouts are depicted in the chapter
“hardware components”) support RS-232-C and are buffered by 16550A
UARTs, with 16-byte FIFOs. You can program them as COM1, COM2,
COM3, COM4, or you can disable them.
The
25-pin
parallel
port
(also
depicted
in
the
chapter
“hardware
components“) is Centronics compatible, supporting IEEE 1284. You can
program the port as LPT1, LPT2, or you can disable it. It can operate in
the following modes:
Standard mode (PC/XT, PC/AT, and PS/2 compatible).
Bidirectional mode (PC/XT, PC/AT, and PS/2 compatible).
Enhanced mode (enhanced parallel port, EPP, compatible).
High-speed
mode
(MS/HP
extended
capabilities
port,
ECP,
compatible).
FDC
The integrated flexible disk controller (FDC) supports any combination
of two of the following: tape drives, 3.5-inch flexible disk drives, 5.25-inch
flexible disk drives. It is software- and register-compatible with the
82077AA, and IBM-compatible. It has an A and B drive-swapping
capability and a non-burst DMA option.
keyboard and mouse controller
The computer has an 8042-based keyboard and mouse controller. See the
chapter “hardware components” for connector pin layouts.