HP Vectra Reference Manual page 55

I/O Channel
1FOH-1 F8H Hard Disc Subsystem
200H-207H Reserved for Game I/O
278H-27FH Parallel Printer Port 2
2F8H-2FFH Serial Port 2
300H-31 FH Reserved for Prototype Card
360H-36FH Reserved
378H-37FH Parallel Printer Port 1
380H-38FH Reserved
3AOH-3AFH Reserved
3BOH-3BFH Multi-Mode Video Adapter Card,
HP45981A
3COH-3CFH Reserved
3DOH-3DFH Reserved
3FOH-3F7H Flexible Disc Controller Susbystem
3F8H-3FFH Serial Port 1
38 Processor Board