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| − | In the [[Sega Genesis]], the '''checksum''' is a rather simple security measure meant to prevent pirates from modifying the ROM image. It may also have been used for internal security, as a method to keep developers from making unauthorized changes to the code. At any rate, it has caused hackers incalculable headache until circumvention methods were discovered.
| + | #REDIRECT [[sega:Checksum]] |
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| − | The checksum is calculated by adding up every word from $200 to the end of the ROM. This is then compared against the value stored in the header, and if the values differ, the game displays a red screen and stops running. Most modern emulators fix the checksum automatically.
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| − | [[Category:Hacking Information]]
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