The Amiga's Custom Chips - ECS
The Enhanced Chip Set (ECS) was used for all of the third generation machines, i.e the A3000, A3000T, A3000UX, A500+ and
A600. It consisted of three main chips, Paula, Agnus and Denise although the Agnus chip underwent a number of upgrades of
its life, and the graphics potential available from the Amiga depends on which chip has been fitted.
The custom chip used to control and move data to be displayed on the screen for all Amigas except the A1200 and A4000.
It is also responsible for timing the machine and even directs animation. Agnus has been upgraded a number of times,
and the capabilites of the one installed in your machine dictates just what characteristics your machine has.
- Super Fat Agnus (8372B) 2Mb Chip RAM, Productivity & super hires modes
- Obese Agnus (8373) 2Mb Chip RAM
The custom chip that is responsible for the video output and is used to maintain the screen display on Amiga models running
the chipset. It controls the resolution, colours, sprites, text lines, etc. On the A1200 and A4000 machines it has been
superceded by the LISA chip to perform the same functions and more. Where the AAA chipset has been fitted these chips have
been superceded by the MONICA chip.
The custom chip responsible for all of the sounds generated from the Amiga. It provides four voices of sound output
configured as two stereo channels with nine octaves over a range of complex waveforms, and uses both amplitude and
frequency modulation. It also handles many of the input/ output tasks such as disk and interrupt control, the mouse,
joystick and serial ports. This chip has been superceded by Mary in the AAA chipset.
Copyright © 2005 Amiga Auckland Inc. All rights reserved.
Revised: September 25, 2005.