This article is from the Apple ][ Emulator Resources Guide, by Alex Maddison with numerous contributions by others.
According to the 'Apple II User's Guide', the read-only memory (ROM) "contents never change, even when you turn the power off. ROM contains the programs which give the Apple II its unique identity and enables it to understand and respond appropriately to the commands you type in at the keyboard." (p.4) Every computer contains ROMs, and understandably, they are copyrighted by the manufacturer. As such, many of the emulator packages listed below do not include the ROMs required to emulate an Apple ][. ROMs can be duplicated from your original Apple computer in the form of binary files - usually the Apple, disk-drive and serial ROMs. Instructions for saving the information from the ROMs into binary files can be found in the text file "dumping-ROMs" available on wilbur. Emulator packages which do not include the ROMs often include instructions on dumping ROMs. This information is specifically indicated in the descriptions below. As an aside, the main Apple ROMs are included on the original DOS3.3 System Master Disk, in the "FPBASIC" and "INTBASIC" machine language files.
ftp://wilbur.stanford.edu/pub/apple2/dumping-ROMs
There are some ROM files available from the following addresses (legally you may only use these ROM files if you own a corresponding Apple computer):
ftp://ftp.apple.asimov.net/pub/apple_II/emulators/rom_images/
 
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