HP Vectra Technical Reference Manual page 360

Address Function
478H-47FH
Printer Timeout Counters
480H-483H
Keyboard Buffer Pointers
484H-488H
Enhanced Graphics Adapter (EGA) Data Area
489H-48AH
Reserved
48BH-48BH
Flexible Disc Data Rate Area
48CH-48FH
Extended Hard Disc Data Area
490H-496H
Extended Flexible Disc Data Area
497H-497H
Keyboard Mode Indicator/LED Data Area
498H-4AOH
Real-Time Clock Data Area
4A1H-4A7H
Reserved
4A8H-4ABH
Pointer to EGA Data Area
4ACH-4EF~
Reserved
4FOH-4FFH
Intra-application Communication Area
500H-500H
Print Screen Status
501H-503H
Reserved
504H-504H
DOS Data Area
SOSH-SFFH
Reserved
8.2.1 RS-232 Communication Port Addresses
The I/O port addresses of up to four serial communication adapter ports are stored in these four
words.
40:000H
02 S40__RS232__ PORT1~DR
40:002H
02 S40__RS232__
PORT2~DR
40:004H
02 S40__RS232__ PORT3~DR
40:006H
02 S40__RS232__
PORT4~DR
Address of serial port 1
Address of serial port 2
Address of serial port
3
Address of serial port 4
Memory Map 351