The Apple II (styled as apple ][) is an 8-bit home computer, one of the first highly successful mass-produced microcomputer products, designed primarily by Steve Wozniak (Steve Jobs oversaw the development of the Apple II's unusual case and Rod Holt developed the unique power supply). It was introduced in 1977 at the West Coast Computer Faire by Jobs and was the first consumer product sold by Apple Computer. It is the first model in a series of computers which were produced until Apple IIe production ceased in November 1993.
There are several working emulators of Apple II series:
Download Apple II emulator Catakig from Catakig Sourceforge page.
Download Apple II emulator Virtual II from http://www.virtualii.com/.
Download Apple IIgs emulator KEGS from http://kegs.sourceforge.net/.
Download Apple IIgs emulator Sweet16 from it's Sheppyware homepage.