[Coco] Copy Protection

[Steve Ostrom]

----- Original Message ----- 
From: "Robert Gault" <robert.gault at att.net>
To: "CoCoList for Color Computer Enthusiasts" <coco at maltedmedia.com>
Sent: Monday, June 28, 2010 10:19 PM
Subject: Re: [Coco] Copy Protection


> The code for *.BAS is essentially the same code found on any of the Tandy 
> OS-9 system or games disks. It permits Disk Basic 1.0 to run the 
> equivalent of the Disk Basic 1.1 command DOS.
> In the case of these game disks, *.BAS is loading some ml code from the 
> disk to memory at $2600. If the bytes at $2600-$2601 are OS, then the code 
> at $2602 is run.
> Since regA is loaded with $22, it is track34 which is being loaded into 
> memory. That means if you have Disk Basic 1.1, you can start the programs 
> by entering DOS instead of RUN"*".
>
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>

Robert, so if I just typed "DOS" the program will load and run the same way? 
Geez, now I feel really dumb.  That means the copy protection was removed 
somehow prior to the disk being made.  I still wonder what was used, and how 
the directory was changed to show center adjusted text followed by the real 
directory.  That was a sweet touch!  I'll use CDM to examine the directory 
track in more detail.

Thanks!

-- Steve --