HP Vectra Technical Reference Manual page 503

CMOS Memory: RAM memory on the Processor Board that is powered by both the system
power supply and battery. When the system power is turned off, the contents of the RAM
memory are preserved by the battery.
Code Module: A group of related processor instructions.
Code Segment
«(5):
The segment address of the code module currently being executed.
Coprocessor: An add-on processor that works with the 80286 processor that is found on the
SPU. The 80287 is an example of a specialized coprocessor for floating point arithmetic.
Cursor Control Pad: The keypad containing cursor control keys.
Cylinder: A term used with multi-platter disc mechanisms, a cylinder is a group of sectors
having the same track number on each of the platters.
Daisy Chain:
A
method of linking devices together in a serial configuration. Input devices on
the HP-HIL loop are connected in a daisy chain.
Data Segment (OS): The segment address of the data currently being accessed.
Data Structures: A related group of data fields.
Describe Record: A data structure utilized by the Input System which contains information
characterizing an input event.
Device: A physical piece of hardware, e.g. a touch screen, mouse, keyboard, dot matrix printer,
ThinkJet, or LaserJet.
Disc Partitions: A group of cylinders within a hard disc volume allocated to a specified
operating system, and its associated programs and data.
Disc Volumes: A group of cylinders comprising a logical disc. The optional 40 Mbyte hard disc
is divided into two disc volumes containing 20 Mbytes each. The optional 20 Mbyte hard disc
contains a single volume.
Divide
By
Zero Interrupt: The 80286 executes this interrupt any time a divide by zero
operation is attempted. The vector to the service routine for this interrupt must be stored in
memory locations OOOO:0000H-OOOO:0003H.
DOS: Disc Operating System.
DOS Installable Device Driver:
A
device driver designed to be dynamically installed by DOS.
DOS installable device drivers may be used to add EX-BIOS drivers to the system.
Driver: Code that interfaces to either a physical 'device' or another driver.
Driver Header: A data structure contained in the data area of each EX-BIOS driver. The driver
header contains data fields that specify the attributes, mapping, and other parameters of the
driver.
EX-BIOS: Extended B!OS. A set of proprietary HP drivers that provide support for various system
features.
494 Glossary