Change RAM, CRAM from addon

For anything related to cart (SRAM, SF2 mapper, audio, CD mode 1, ...)

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cloudstrifer
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Joined: Mon Feb 19, 2018 7:31 pm

Change RAM, CRAM from addon

Post by cloudstrifer » Wed Sep 22, 2021 2:41 pm

Hi, I like to know if there is some way to change RAM, CRAM and execute complex functions through addon on Sega Genesis. ​

My initial project will be a cheat device, someone can help me?

TmEE co.(TM)
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Re: Change RAM, CRAM from addon

Post by TmEE co.(TM) » Thu Sep 23, 2021 1:22 am

Cartslot is slave only with no means to do bus mastering (it cannot initiate writes to the console, only receive them) so you'll need software help. One way is to hijack frame interrupt, do your thing in it and then run the original handler, but it might break timing sensitive games.
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Miquel
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Re: Change RAM, CRAM from addon

Post by Miquel » Thu Sep 23, 2021 7:31 pm

Taking ownership of an exception and execute a program is my first thought.

I believe Everdrive does save states... some spying work there maybe...
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