ECS is an acronym for Enhanced Chip Set.

ECS is the name used for the enhanced version of the Amiga computer's original chipset (OCS). ECS was introduced in 1990 debuting in the Amiga 3000. Amigas produced from 1990 onwards featured a mix of OCS and ECS chips, or even a full Enhanced Chipset. In 1991 ECS was officially introduced to the low end Amigas with the introduction of the A500 Plus. The last Amiga to use ECS was the Amiga 600.

ECS included the improved Super Agnus (with support for 2 MB of CHIP RAM) and Super Denise chips. Other additional features include:

• Support for Productivity (640x480 noninterlaced) and SuperHires (1280x200 or 1280x256) display modes, which were however limited to only 4 colors.
• Ability of the blitter to copy regions larger than 1024x1024 pixels in one operation.
• Ability to display sprites in border regions (outside of any display window where bitplanes are shown).

It was followed by the AGA chipset.