Editing Apple ProDOS (section)

===Unlicensed Apple II clones===
With the release of ProDOS version 1.01 and higher, a check was added to see if it was running on an official Apple-manufactured computer. If the word "Apple" is found in the computer's [[read only memory|ROM ]] [[firmware]], ProDOS will load up as normal. If anything else is found (e.g. "Golden", "[[Franklin Electronic Publishers|Franklin]]", "Elite") ProDOS refuses to run, locking up at the boot [[splash screen]]. This measure was taken by Apple Computer to discourage use of unlicensed Apple II [[clone (computing)|clones]]. It is still possible to run newer versions of ProDOS on clones by applying a small byte [[patch (computing)|patch]] to a given version of ProDOS. Some users go as far as replacing their physical ROM chip(s) with an illegally copied version of Apple's own ROM, or a custom patched ROM with "Apple" added in the name.