HP Vectra XU5 Reference Manual page 29

Serial/Parallel Ports
One serial port and one bidirectional parallel port are supported by the Super I/O chip set.
The serial port is a high speed UART with 16 Byte FIFO and can be programmed as COM1,
COM2, COM3, COM4, or disabled.
The parallel port can operate in three modes:
Standard 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).
It can be programmed as LPT1 (378h, IRQ7), LPT2 (278h, IRQ5), or disabled with
PC87332VF registers.
Vectra XU Technical Reference System Overview 29