add a rom_self_check test #277
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this replaces the original SRAM check routine that was already bypassed and allows the player to hold START + SELECT + UP on boot during the Nintendo Logo, a flashing blue screen will be entered that will calculate the checksum of the actual rom bytes and compare it against the stored checksum and complement in rom. This takes about 30-40 seconds, if the checksum is valid a green screen is displayed and the player can press start to reboot the game, if the checksum is invalid then a solid red screen forever is displayed.
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romchk.mp4not the greatest quality video but gives an idea. |
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this replaces the original SRAM check routine that was already bypassed and allows the player to hold START + SELECT + UP on boot during the Nintendo Logo, a flashing blue screen will be entered with some music, that will calculate the checksum of the actual rom bytes and compare it against the stored checksum and complement in rom.
This takes about 30-40 seconds, if the checksum is valid a green screen with fanfare is displayed and the player can press start to reboot the game, if the checksum is invalid then a solid red screen forever is displayed.
Originally I wanted to run this on a per frame basis in the background but it takes too long and just opens another can of worms if something unexpected happens / false triggers etc... jumping into it on boot seems the best way.. if anyone is having issues can just tell them to run the self check first.
i'll mark this as draft for now anyway.