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Copy Unprotecting King's Quest ][ Version 1.0W. by Independent (IND)

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  • KQ2UNP.COM
  • KQ2UNP.DOC
  • Zip / DOS   How to
  • 3 kB   DOWNLOAD   SHARE

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                Copy Unprotecting King's Quest ][ Version 1.0W
                              by the Road Runner
                                 July 4, 1986


In commemoration of 100 years of the Statue of Liberty, the accompanying 
program and simple procedure will liberate your King's Quest ][ (Version 1.0W) 
from the chains of copy protection, by creating a non-protected backup. To 
create the backup, you will need: 

     .  An IBM PC, XT, AT or compatible running DOS 2.0 or greater and
         having a 360KB or 1.2M drive identified as A,
     .  The original King's Quest ][ (Version 1.0W) Diskettes 1 and 2,
     .  Two blank diskettes on which the backup will be made,
     .  Two diskette labels and two write protect tabs,
     .  The DOS program DISKCOPY (or equivalent),
     .  The accompanying program KQ2UNP.COM,
     .  These instructions.

Follow these simple steps:

     1.  Run DISKCOPY to make a backup of KQ-][ Disk 2 onto one of the blanks.  
You should have no difficulty making this copy since Disk 2 is not protected.  
Label the copy "KQ-][ Disk 2" and put a write protect tab on it.  

     2.  Using DISKCOPY, make a backup of KQ-][ Disk 1 on the other blank 
diskette.  Since it is protected, you should expect to see an "Unrecoverable 
read error on track 6" message, followed by a "Target disk may be unusable" at 
the end of the copy.  Ignore these warnings.  

(NOTE: If you do -not- get the warnings, you may not have the right version of 
KQ-][ and these procedures may not work.  Instructions for unprotecting 
earlier versions of KQ-][ can be found on several bulletin boards.) 

     3.  Run program KQ2UNP and follow its directions: 

         .  Insert the original KQ-][ Disk 1 in Drive A, then press ENTER,
         .  Remove the orginal, put the Disk 1 copy in Drive A, then press 
            ENTER. 

     4.  Remove the backup, label it "KQ-][ Disk 1" and put a write protect 
tab on it.  

You are done!!  Enjoy the freedom!!  

------------------------------------------------------------------------------

For those of you who would like to know how the copy protection and copy 
unprotection work, here is an overview of the details.  

Copy Protection:

Track 6 Side 0 of KQ-][ Disk 1 has been specially formatted so that it cannot 
be duplicated by most software disk copy programs.  When KQ-][ is booted, it 
eventually reads track 6 to determine that the special format is present.  
Specifically, it reads track 6 side 0 sectors 8 to 2 (backwards) as 1024 byte 
sectors, then reads sector 1 as an 8192-byte sector.  It expects to find each 
sector, and to get a CRC error on each read. If what is read is the expected 
data, it assumes you have the original KQ-][ Disk 1, and runs the game.  It 
never makes this check again during the game.  

Copy Unprotection:

The copy unprotection design takes advantage of several characteristics of the 
KQ-][ copy protection scheme.  

        1.  Most importantly, KQ-][ uses ROM BIOS INT 13 calls to read the 
copy protected sectors, hence a demon can be introduced to intercept KQ-][ 
calls and fool the progam into believing it is reading the original.  

        2.  The diskette is formatted with 9 512-byte sectors per track and 
track 6 side 1 is not used by KQ-][.  The 8192-byte sector of copy protected 
data from side 0 can be stored in 16 of the 18 standard 512-byte sectors on 
track 6 sides 0 and 1.  

Program KQ2UNP reads the boot record and copy protected data from the original 
KQ-][ Disk 1.  On the copy, it writes a Road Runner produced boot record on 
track 0, and a demon, the original boot record and copy protection data on 
track 6.  

When the KQ-][ copy is booted, the Road Runner boot record reads track 6 into 
memory, installs the demon, then gives control to the original boot record.  
The demon passes on all disk read requests to the ROM BIOS until KQ-][ asks 
for track 6 data.  It then feeds KQ-][ the copy protection garbage it expects, 
until the last read call to track 6.  The demon then uninstalls itself and 
vanishes, leaving no trace.  

------------------------------------------------------------------------------
Note:  This program and writeup can also be used to unprotect The Black 
       Cauldron Version 1.1J.