Re: Realms of Darkness by SSI

[Andy McFadden <fadden@fadden.com>]

macdog <bigdog128@gmail.com> wrote:
> I have done a bit of reading and I have read that most of the SSI
> games used a disk operating system called R-dos.  Supposedly, all the
> games are protected in the same manner?  I find this hard to
> believe...so I'm not buying that until I learn a bit more.  I have
> been reading "Beneath Apple DOS" in attempt to learn enough to do
> this, but I admit, I am in over my head..though I am enjoying learning
> about it.

It very likely used RDOS.  I believe the disks had modified sector headers,
but they always used the same thing.  The part of the protection used to
defeat nibble copies was in the "QWERTY" file, which is easy to disable
once you normalize the sectors.

The RDOS converter can be found here:

  http://fadden.com/dl-apple2/index.htm#rdos

The original articles are in COMPUTIST issue #52 and #85, the former
available on computist.textfiles.com.  Some games transferred without
any modifications, some (notably those that called into RDOS from assembly)
required some patching.

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