 Additionally, features from the improved Kickstart 2 operating system were used in subsequent software, and since these two technologies largely overlap, some users misjudged the significance of ECS.It is possible to upgrade some OCS machines, such as the Amiga 500, to obtain partial or full ECS functionality by replacing OCS chips with ECS versions.ECS was followed by the third generation AGA chipset with the launch of the Amiga 4000 and Amiga 1200 in 1992.