17. Glossary
Apple-Compatible Driver: A Macintosh system extension that addresses the scanner in Apple Scanner
emulation mode. This is used for programs that do not support the PhotoShop Plug-in protocol or do not
drive the scanner directly.
Application Software: Software that is used to perform a specific function, e.g., image processing, OCR
(Optical Character Recognition), or DTP (Desktop Publishing).
ASPI: Advanced SCSI Programming Interface; SCSI communication standard developed by Adaptec.
Black and White: A 1-bit image file capable of only displaying black and white image data with no
intermediate gray levels.
DIP Switches: Small switches mounted in or on computer equipment that set certain perimeters.
Document Cover: The plastic cover that is lowered over a document on the scanner’s object glass.
Expansion Slot: A connector and bracket system in a computer into which an expansion or interface card
can be inserted to add functions to a computer system.
Expansion Slot Cover: A metal or plastic dust cover that covers the exterior “hole” in an expansion slot.
Folder: An electronic storage area used to store and organize files and other folders and is often
represented on a computer by a folder-like icon.
Grayscale: An 8-bit image file capable of representing all tones and colors in the image using 256 shades
of gray.
I/O Base Address: An address that is used for communication between a host computer and an expansion
or interface card. All cards in a computer system must be set to different I/O addresses.
Icon: The graphical representation of a computer file or piece of computer software.
Indicator Panel: The area of the scanner that contains the LED indicators to show scanner status.
Interface Card: A card that is inserted into an expansion slot to allow the connection of a peripheral
device to a PC.
Non-TWAIN Driver: An interfacing system that does not follow the TWAIN standard and is designed for
a specific software package and a specific image input device.
Object Glass: The tempered glass of the scanner where documents or objects to be scanned are placed.
Optical Assembly: The component system of the scanner that contains all of the optical components.
Sometimes referred to as a carriage or carriage assembly.
Peripheral Device: A device attached to a computer that adds functionality to a computer system.
Ready Indicator: The indicator that glows when the scanner’s power cable is connected to the scanner
and a “live” outlet and the power switch is turned on.
SCSI Chain: One or more SCSI devices connected to the same SCSI controller.
SCSI Device: A device which connects to a computer using the SCSI interface.
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