ATI Technologies FIRE GL1 User's Guide download pdf (Page 51)

Glossary

Horizontal Frequency

Rate at which a monitor displays each scan line, usually measured in kilohertz (kHz).

The value must be set depending on the operating limits of the monitor in order not

to damage it.

Hue

Synonym for color.

I/O Port

Input/Output port. An address used to access a hardware device.

Indexed 16 and 256 Color Images

Indexed color images contain a color table in the file. This table lists all the colors

that could be used in the file. An indexed 16-color image contains a table with 16

color entries (4 bits) whereas for an indexed 256 color image 256 colors are listed

(8 bits).

Other colors can be simulated in a way similar to using grayscales in a black-and-

white image, by simply positioning the pixels in varying densities. The eye then sees

color mixtures that are not actually in the color table.

You can transform images into indexed color images in order to load them into

programs such as Windows Paintbrush, or just to see them on monitors that can

only display 256 or 16 colors.

Interlaced Display

Monitor that refreshes every other scan line (odd or even) every other pass of the

screen. Thus higher graphics resolution is possible, but more flickering occurs than

with non-interlaced monitors which refresh the entire screen (every scan line) every

pass of the screen.

Interrupt Request (IRQ)

Signal used by a device, such as a mouse, to inform the CPU that it is present and

functioning and to trigger certain procedures.

Jumper

Small plastic plug that fits over a pair of pins. When the plug straddles two pins it

makes an electrical connection. The computer makes decisions based on whether

the connection is made or not. A group of jumper pins is called a jumper block.

Kbps

Kilobits per second - a quantity for measuring transmission speeds.

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ATI Technologies FIRE GL1 User's Guide Page 51