Extended chip set is the name used for the extended version of the Amiga original chipset (OCS). It was followed by the AGA chipset.
It came bundled with the A500plus, A600 and A3000 computers.
ECS included the improved Super Agnus (with support for 2 MB of CHIP RAM) and Super Denise (with support for Super-HiRes graphics modes) chips.
Elitegroup Computer Systems is a Taiwan-based electronics firm. It is among the biggest motherboard manufacturers in the world.