Konami Collector's Series: Castlevania & Contra

Konami Collector's Series: Castlevania & Contra
Developers: Konami Software Shanghai, Konami Computer Entertainment Hawaii Publisher: Konami Platform: Windows Released in US: November 16, 2002 This game has unused modes / minigames.

An official emulator on a disc that features five NES games from the two big Konami franchises that start with the letter "C". It was soon discovered that the game contained somewhat altered NES ROMs of the Castlevania and Contra games, mostly to remove references to Nintendo. The ROMs themselves were released after the discovery was posted on a message board in December 2002, and they've been available on the internet since then.

Nearly eighteen years later, the compilation was rereleased on GOG with the DRM removed.

The Beginning of a Legend...

To do: Document all the changes done to the games in this set versus the original dumps.

Unused Game

Despite having no real connection to either Castlevania or Contra aside from being made by Konami, a Jackal ROM is present in the executable. The fact that it has also been edited suggests it was meant to be a playable bonus, but Konami never released a method to play Jackal in the emulator itself.

You can trick the program into loading Jackal by using Cheat Engine: Start the game, and once you get to the game selection menu run Cheat Engine, select CC.exe from the process list, and modify memory address 94AC78 in byte form so its value is 5. Return to the game, press Enter, and Jackal will load up. (The actual memory address found by Cheat Engine is 54AC78, but the relative memory address adds 400000 to its actual location.)

Note that if you change the value of this memory address before the game selection menu loads completely, the program will crash.

(Source: Buddha, qwe)