Yeah, Amiga 1000 only had a bootstrap ROM, which is what led to having a Kickstart ROM with part of the OS in it—same with the original Atari 260ST/520ST. Apple

Yeah, Amiga 1000 only had a bootstrap ROM, which is what led to having a Kickstart ROM with part of the OS in it—same with the original Atari 260ST/520ST. Apple’s Lisa also had only a bootstrap ROM, which is why it originally had two Twiggy drives and everyone got a hard disk. Macintosh made the decision to put the OS in ROM to save disk space and make a single-floppy 128KB RAM system livable, but that only lasted a few months since the OS needed fixes and issuing new ROMs is expensive. Nonetheless Amiga and Atari ST did the same thing, and kept pursuing it far beyond when it was a reasonable trade-off just like Apple—who only went back to a bootstrap ROM with the “New World” systems in the very late 1990s.