Devices On The Isa Bus; Super I/O Controller - HP Vectra VA6 Technical Reference Manual

Serial / parallel
communications ports
FDC
RTC
Keyboard and Mouse
Controller

Devices on the ISA Bus

Super I/O Controller

The Super I/O chip (NS PC87308) provides the control for two FDC
devices, two serial ports and one bidirectional multi-mode parallel port.
The two 9-pin serial ports (whose pin layouts are depicted on page 44)
support RS-232-C and are buffered by 16550 UARTs, with 16 Byte FIFOs.
They can be programmed as COM1, COM2, COM3, COM4, or disabled.
The 25-pin parallel port (also depicted on page 44) is Centronics
compatible, supporting IEEE 1284. It can be programmed as LPT1, LPT2, or
disabled. It can operate the four 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).
The integrated flexible drive 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 100% IBM compatible. It has an A and B drive-swapping capability and a
non-burst DMA option.
The real-time clock (RTC) is 146818A-compatible. The configuration RAM
is implemented as 256 bytes of CMOS memory.
The PC has an 8042-based keyboard and mouse controller (the connector pin
layouts are shown on page 44). The PC is supplied with a Logitech 2-button
mouse, and a C3758A keyboard with the following features:
Space bar power on, to start the computer from the Off state (if
is enabled in the Setup program).
from keyboard
Windows key (next to the
clicking the "Start" button on the Windows 95 task bar.
Pull-down key (next to the right
clicking the right mouse button.
keys), which has the same effect as
key), which has the same effect as
2 System Board
Devices on the ISA Bus
power on
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