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19 of 13,320 files dos

    Download KQ2UNP.zip

    Size 2 kB

  • This download is an executable MS-DOS program that will not run on a modern computer. It needs a DOS emulator such as DOSBox-X, Staging; or a virtualized MS-DOS or FreeDOS system.
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  • Last modified Jun 21, 2015 10:25:28 PM
     MD5 checksum 6f31657c12085d5b288808373b9b8564
        Mime type Zip archive data

1986 July 4

  • Zip - DOS / Guides and how-tos
  • Road Runner, writer credits

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2 items in the archive
  • KQ2UNP.COM
  • KQ2UNP.DOC
[+] Configuration Copy text
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.
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