#Snes9x bad checksum manual#
which is why I explained the manual fix method. That's not something that the utility is going to fix for you. And if you didn't change BOTH, then snes9x would report it as incorrect. There were some really large romhacks that were expanded via copy & paste, which meant that the Checksum showed up TWICE. (The above procedure should work most of the time, but if i remember correctly, there's an edge-case with flipping the ones & zeros, but it's so late at night that I cannot remember).īut there is an edge-case that I do remember. Convert from Binary to Hex and that's your Compliment:īut remember that when you write it to the rom file, to input the byte sequence backwards: (1) Compliment least significant byte (2) Compliment most significant byte (3) Checksum least significant byte (4) Checksum most significant byte. Now open up another calculator in Programmer mode with Binary of size Word: Type in the exact opposite of the checksum: Meaning, every time you see a 0, put 1 and every time you see a 1, put 0. Now change to Word and change to Bin (Binary). Remember to change to Hex: Type in the hexadecimal representation of the checksum-16.
#Snes9x bad checksum windows#
To calculate the Compliment, open up your Windows Calculator in Programmer mode. Okay, now you have the correct checksum from your Hex Editor adding up all the bytes in the romhack. If it's not correct, then in your Hex Editor, choose Analysis -> Checksums -> Checksum-16 (on the entire file: NOT just whatever you happen to have selected). This 1FE value indicates that the Checksum & Checksum compliment are correct. Then add 32 + 54 + CD + AB: You should get 1FE. Open up Windows Calculator & change the View to Programmer. If the Header Checksum Compliment says "5432" and the Header Checksum says "ABCD" then you would find & search for (Control+F) "3254CDAB" in your hex editor. There is only one game that I have that this happens to, I was just wondering what it ment cause the game seems to work fine. You can use a hex editor to fix it: Simply open up the romhack in snes9x, then goto File -> "Rom Information". I was loading a game on my Snes9x v1.41-1 for Windows, and I noticed while it was starting up that it said 'Bad Checksum'.
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