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{{for|emulators that run on Windows 3.x|Emulators on Legacy systems#Windows 3.x}}
{{for|emulators that run on Windows 9x|Emulators on Legacy systems#Windows 9x}}
{{for|emulators that run on Windows 2000, Windows XP and Windows Vista|Emulators on Legacy systems#Windows NT}}
The PC architecture originates from the 1981 IBM PC 5150. Due to being designed with off-the-shelf hardware, clone manufacturers could produce compatible hardware and was only limited by the copyright on the PC's BIOS. To circumvent this, competitors such as Compaq created their own compatible BIOSes using clean-room reverse engineering.[https://emulation.gametechwiki.com/index.php/Legal_Status_of_Emulation#Avoiding]
