HP Vectra

SECTION 3.
BASIC INPUTI
OUTPUT
SYSTEM
The Basic Input/Output System (BIOS) is a set of programs that is
stored in the ROM on the processor extension card in the FOOOO
segment. For a more complete description of the BIOS refer to HP
Vectra Technical Reference Manual Volume 2: System BIOS.
Table 3.1
BIOS Interrupt Summary
Address
Range
INT
BIOS Entry Summary
8-B
2 NMI Parity error is
detected.
14-17
5 PRINT SCREEN Default routine that
prints the video
screen characters.
20-23
8
TIMER INT Called each clock
tick (18.2 sec.).
24-27
9 KEYBOARD INT Handles keyboard
activity and
controller.
40-43
10
VIDEO 10
Handles all video
reads and writes,
palettes, lightpens,
and scrolling.
44-47
11
EQUIPMENT
Reports attached
DETERMINATION
devices, i.e., printers,
RS-232 ports,video,
disc drives,
80287.
Basic Input/Output System 53