|
|
| Line 1: |
Line 1: |
| − | 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. [[Esrael]] wrote a program [[ESE FixCheckSum]] to correct the checksum. Emulators like [[Kega Fusion]] and [[Gens/GS]] provide an option to automatically correct checksums when a ROM is loaded.
| + | #REDIRECT [[sega:Checksum]] |
| − | | |
| − | 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.
| |
| − | | |
| − | Some games, such as ''[[Sonic & Knuckles]]'', lack checksum checks, possibly because of the time required to check the entire ROM.
| |
| − | | |
| − | [[Category:Hacking Information]]
| |
