Page "Amiga Enhanced Chip Set" Paragraph 1

Notable improvements were the Super Agnus and the Hires Denise chips.

The sound and floppy controller chip, Paula, remained unchanged from the OCS design.

Super Agnus supports 2 MB of CHIP RAM, whereas the original Agnus / Fat Agnus and subsequent Fatter Agnus can address 512 KB and 1 MB, respectively.

The ECS Denise chip offers Productivity ( 640 × 480 non-interlaced ) and SuperHires ( 1280 × 200 or 1280 × 256 ) display modes ( also available in interlaced mode ), which are however limited to only 4 on-screen colors.

Essentially, a 35 ns pixel mode was added plus the ability to run arbitrary horizontal and vertical scan rates.

This made other display modes possible, but only the aforementioned modes were supported originally out of the box.

For example, the Linux Amiga framebuffer device driver allows the use of several other display modes.

Other improvements were the ability of the blitter to copy regions larger than 1024 × 1024 pixels in one operation and the ability to display sprites in border regions ( outside of any display window where bitplanes are shown ).

ECS also allows software switching between NTSC and PAL video modes.