man, a lot of people don't know the computer history from the 80s... oh yeah, most of YOU guys were NOT THERE! My first computer in 1983 with the Commodore VIC20. 1mhz, 3.5k of RAM, 8 colors... no floppy drive, but cassette (same as audio tapes).
MS bought QDOS, which itself was nothing more than a re-engineered version of CP/M. This was to get the contract deal from IBM - who was/is in the Mainframe business and wanted to sell PC computers to their customers... they didn't care what it was. Due to WEAK contracts with MS... MS was able to sell MS-DOS to anyone - which created the CLONE Market for which every PC company NOT IBM is thankful for.
MS-DOS was always a sub-standard crappy OS. Especially by the mid 80s and beyond and it would take MS 10 more years to come out with a semi-modern OS known as WIndows95. Things like LOOOONG file names were on Mac and Amigas for a long long time.
[citation][nom]reggieray[/nom]Billy boy ripped off DOS and copied windows from Apple and Atari.[/citation]
Gates bought "DOS" for $25,000 and licensed it out to IBM. Nothing was ripped off. Apple didn't invent the GUI... in fact, even before the macintosh ever came out - there were already several GUI based computer system - but these were about $20,000~100,000. Windows 1.0~3.x were GUI Shells, not an OS - there wasn't much like Mac on Windows... other than a mouse/pointer which Apple didn't invent.
Nobody copied ATARI ST. Its the opposite. The Amiga company was running out of money and Atari made a bid for that technology with a loan. (Amiga was designed by the same designer who made the Atari 600/800 8bit computers - Jay Miner, who I have actually talked to once, thanked him). But Commodore gave them a better deal. The CEO of Atari used to work for Commodore. They knew the basics of the Amiga. The threw together the Atari ST with an 8mhz 68000 (same as Amiga and Mac) the GEM/TOS "OS" was pretty much MS-DOS with a Macintosh look. Apple made Atari degrade the interface... and GEM/TOS had all the limitations of MS-DOS, but with a GUI.... 8.3 file names, no multi-tasking.
In those days... people DID solder RAM chips on top of one another to add memory.