This article is from the Apple II Csa2 FAQ, by Jeff Hurlburt with numerous contributions by others.
Apple II's from an Apple II+ with 64k RAM through the IIgs can run
versions of ProDOS up through version 1.9 and run Applesoft BASIC programs
under these versions.
An older Apple II (with Integer BASIC in ROM) or any Apple II with less
than 64k RAM can run ProDOS 1.0 or 1.0.1 but can not use the ProDOS BASIC
interpreter (BASIC.SYSTEM). This is not a very useful setup as there are few
applications that will work in this environment.
Versions 2.x.x of ProDOS require an Apple II equipped with a 65C02,
65C802, or 65C816 such as an Apple IIe-enhanced, //c, IIc+, or IIgs. The
current ProDOS is version 2.0.3.
By: Rubywand
 
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