Commodore:
Apple:
Atari:
- Understood the value of hardware acceleration for multimedia right from the start.
- Embraced third-party hardware expansion from the get-go.
- Had true preemptive multitasking and a well-documented high-efficiency kernel.
- Had only basic memory management, with a tendency to fragment.
- Provided only a rudimentary UI library, leading to Unix-like inconsistency and competing standards.
- Gave us Lemmings.
Apple:
- Did almost as well with multimedia in software.
- Opposed hardware expansion at first and never really warmed to it.
- Had only cooperative multitasking.
- Had an inventive Resource Manager used pervasively throughout the system.
- Placed a strong emphasis on good UI design and consistency across applications.
- Gave us Myst.
Atari:
- Hahaha, get real.