My favorite retro games sources:

Updated 02/06/2015 Home systems:

Every main retrosystem :
http://www.planetemu.net/

This site hs the most complete Software collection for every major retro systems like C64, Atari ST, Amstrad, Amiga bit also consoles like the NES, Atari 2600/7800 Playstation etc..
There is PC DOS software or games!

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PC DOS systems: