This goes way over my head, can you translate this to English 
ZX81 (Sinclair Basic Interpreter)The Sinclair BASIC interpreter was the built-in software environment used on Sinclair’s home computers (ZX80, ZX81, ZX Spectrum, and later models like the QL).
VIC-20 (Commodore Kernal and Basic 2.0)On Commodore 8-bit computers (PET, VIC-20, C64, etc.),
two main pieces of firmware lived in ROM: the KERNAL and Commodore BASIC.
Amstrad (AMDOS) AMDOS stood for Amstrad Disk Operating System.
It was the disk extension layer for the Amstrad CPC (and later PCW) computers.
It sat on top of CP/M or the CPC’s built-in firmware to provide disk file handling.
Amiga (AmigaOS).AmigaOS is the native operating system for Commodore’s Amiga line of computers (first released in 1985 with the Amiga 1000).
It was one of the most advanced home computer operating systems of its time.

Why it was specialIn the mid-1980s, PCs were running MS-DOS (text-only, single-tasking),
and Macs had a GUI but no pre-emptive multitasking.
The Amiga gave you color graphics, sound, multitasking, and a GUI all at once — way ahead of its era.
That’s why it became legendary for games, graphics, video production, and music.
Why not to use Apple / Mac / Iphone
It's only for fags