Amiga 3000 3.1 roms vs. Amiga 1200 3.1 roms

[gnarly]

Noster wrote:
This bonus code is also present in the 3.1 ROMs and still found in the resident list, when the OS 3.9 patch is made.
But what I'm not knowing is: What is the purpose of this resident module?

From http://wuarchive.wustl.edu/aminet/util/misc/MakeSuperDisk.readme

The extra data, called "the bonus code", is to make the image files usable with the A3000. Without the bonus code the machine will not configure its fast RAM or the SCSI hardware. The boot ROM code will make the images reset resident with the bonus code and enable special features, such as the "A2630" emulation for Kickstart 1.3.

HTH :-)