Glossary - Commodore Amiga A1000 Hardware Reference Manual

GLOSSARY

AGNUS
One of the three main Amiga custom chips. Contains the blitter, copper, and DMA
circuitry.
ALIASING DISTORTION
A side effect of sound sampling, where two additional frequencies are produced, distorting
the sound output.
ALT KEYS
Two keys on the keyboard to the left and right of the Amiga keys.
AMIGA KEYS
Two keys on the keyboard to the left and right of the space bar.
AMIGADOS
The Amiga operating system.
AMPLITUDE
The voltage or current output expressed as volume from a sound speaker.
AMPLITUDE MODULATION
A means of increasing audio effects by using one audio channel to alter the amplitude of
another.
ATTACH MODE
In sprites, a mode in which a sprite uses two DMA channels for additional colors. In sound
production, combining two audio channels for frequency/amplitude modulation or for
stereo sound.
AUTOMATIC MODE
In sprite display, the normal mode in which the sprite DMA channel, once it starts up,
automatically retrieves and displays all of the data for a sprite. In audio, the normal mode
in which the system retrieves sound data automatically through DMA.
BARREL SHIFTER
Blitter circuit that allows movement of images on pixel boundaries.
BAUD RATE
Rate of data transmission through a serial port.
BEAM COUNTERS
Registers that keep track of the position of the video beam.
BIT-MAP
The complete definition of a display in memory, consisting of one or more bit-planes and
information about how to organize the rectangular display.
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