Is it fair to say that any upgrade from the OCS chipset, such as the Fatter Agnus, is an 'ECS' chip? Or is it best termed an upgraded OCS chip, since it has only 512k RAM?
If I remember rightly, one of the features of the Fatter Agnus 'upgrade' was the ability to switch between 50 and 60 Hz, so you could 'stretch' NTSC games to fill the PAL screen, using a scan-lines type effect. I don't think the OCS chip could do this.
Shadowfire, what do you mean when you say there is no such thing as ECS Denise? I thought ECS Denise chip was specifically emulated in WinUAE.