[Coco] Shamus... copy protected?

[John Donaldson]

IIRC, the utility would cycle a write just on that sector and the 
clobbering was done by opeing the drive door.

John Donaldson



Arthur Flexser wrote:

>I wonder what is involved in "clobbering" the single sector?  Is it sufficient
>to change the sector number in the sector header to some illegal value, for
>example?  Mess up the checksum bytes?  Were there any commercial CoCo disk
>zappers that had access to the header information in order to do this?
>
>Art
>
>On Tue, 25 Dec 2007, John Donaldson wrote:
>
>  
>
>>I remember back right after Sands of Egypt came out, someone wrote a 
>>utility that not only copyied Sands of Egypt to another disk, then 
>>clobered the single sector so the copy would play..
>>
>>
>>Neil Morrison wrote:
>>
>>    
>>
>>>Sands of Egypt works the same way IIRC, it has one bad sector and looks for
>>>that. If it finds a good sector it bombs out. I copied it on a Model III
>>>with Trakcess.
>>>
>>>Neil
>>>
>>>On Dec 25, 2007 3:05 PM, Rogelio Perea <os9dude at gmail.com> wrote:
>>>
>>> 
>>>
>>>      
>>>
>>>>Just unearthed this Radio Shack game for the CoCo: Shamus. Before running
>>>>the program in my CoCo 3 I tried to back up the original disk and BACKUP
>>>>bombed in the middle of the process, I heard the drives spin and the head
>>>>positioning mechanism go through its motions until the familiar "multiple
>>>>attempts to read" sound gave a warning of trouble... soon after came the
>>>>I/O
>>>>Error report.
>>>>
>>>>The game loads and plays with no problem so I assume copy protection is at
>>>>work here. When running the Basic loader, right after the binary begins to
>>>>LOADM there are a few repetitious reads from the drive that sound almost
>>>>as
>>>>a failed load but then the game starts; final check to see if game is
>>>>pirated or not?
>>>>
>>>>Just curious... my disk zapper also fails to read one sector at the
>>>>directory track...
>>>>
>>>>
>>>>-=[ Rogelio ]=-
>>>>
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>>>>
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>>>>
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>>>
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>>>
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>>
>
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