HP Vectra Reference Manual page 238

Glossary
Architecture:
The design order of the system.
Break:
The scan code the keyboard sends when a key that has
been pressed is released.
Checksum:
A sum of numbers used to detect equipment
malfunctions in data-transfer operations.
Flexible disc: Thin flexible platter that is coated with a magnetic
material used a a storage medium. Also know as floppy disk.
HP-HIL:
The Hewlett-Packard Human Interface Link, a standard
for interfacing a personal computer, terminal, or workstation to its
input devices, providing a standard interface across the Hewlett-
Packard computer product line.
HP-HIL Controller:
Developed by Hewlett-Packard to interface
the system to the HP-HIL input devices. It can accept commands
from the system microprocessor and transmit and receive
information via HP-HIL. It can also poll the input devices, collect
data entered by the user, and relay it to the system.
Make:
The scan code the keyboard sends for a key when it is
pressed.
Processor Extension Card: On the HP Vectra, the system
memory is contained on the processor extension card. This card is
directly connected to the processor card via VLSI.
Schematic:
A diagram with detailed information relating to
circuitry, layout, terminal identification, showing gates, and
showing circuits, etc.
Tilde:
Symbolized by --. Used to indicate signals that are active
low.