HP Net Vectra Technical Reference Manual page 21

Serial / parallel
communications ports
FDC
Keyboard and Mouse
Controller
The chip provides the control for the following devices.
Keyboard controller
Mouse controller
RTC and Advance power supply controller (APC)
Flexible disk controller
Parallel port controller
UART2 and IR controller
UART1 controller
General purpose I/O (GPIO)
Power management
The 9-pin serial port (whose pin layout is depicted on page 42) supports RS-
232-C and is buffered by a 16550 UART, with a 16 Byte FIFO. It can be
programmed as COM1, COM2, COM3, COM4, or disabled.
The 25-pin parallel port (also depicted on page 42) 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 from 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 computer has an 8042-based keyboard and mouse controller. The
connector pin layouts are shown on page 42. The Power-on keyboard is
described on page 29.
Function
2 System Board
Chip-Set
Logical device number
0
1
2
3
4
5
6
7
8
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