Re: Source Code for OS?

[dempson@actrix.gen.nz (David Empson)]

olcott <olcott@qwest.net> wrote:

> Does anyone have original source code for any of the apple II OS? If not
> original source code, what about disassembled code? I would especially
> like to have DOS 3.3, and the patches and fixes in source code form.

The Quality Software book "Beneath Apple DOS" has a commented breakdown
of the DOS 3.3 code.  It isn't a full disassembly, but it is good enough
that you can easily generate one.

Beneath Apple DOS might still be available new from Byte Works
(http://www.byteworks.org).

There was also Beneath Apple ProDOS, which had three supplements
containing corresponding commented breakdowns of ProDOS versions as far
as ProDOS-8 1.3.  I've heard that these supplements are now out of
stock, but I'd check with Byte Works for confirmation.  The base book
doesn't contain any internal code details, only interface documentation
and underlying hardware details.