ECS stands for Enhanced Chip Set, the latest version of the Amiga's custom
chips that provides for improved graphics capabilities.  Some of the
special features of the Amiga's graphics sub-system such as the VGA,
Productivity and SuperHires display modes require the ECS.

 SuperHires (35 nanosecond) Pixel Resolutions 
 Productivity Mode 
 Selectable PAL/NTSC 
 Determining Chip Versions