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Re:How I make graphics for retro systems and retro-styled games by andy800 on Tuesday March 16, 2021 @02:40PM (#26481001)
There's an active community at tecmobowl.org, they have been releasing updated versions of Tecmo Super Bowl (originally 1991) annually. Updated player rosters. Lots of graphics mods. Tons of gameplay "hacks".

Mostly focused on the NES original but also SNES and other platforms.

As someone who just recently got into this hobby, I agree with the author that YY-CHR is essential!

Re:How I make graphics for retro systems and retro-styled games by jandrese on Tuesday March 16, 2021 @03:22PM (#26481585)
That's basically the same thing EA does with their sports franchises, except they charge full price for the update each year.
Re:How I make graphics for retro systems and retro-styled games by fuball63 on Tuesday March 16, 2021 @03:10PM (#26481432)
My favorite football game is Madden 95, and my favorite year of watching football as a fan was 2003 so I always wanted to create an updated ROM. Do you know of any good resources? How do you figure out what the data format is for stats, just trial and error?
Re:How I make graphics for retro systems and retro-styled games by andy800 on Tuesday March 16, 2021 @03:48PM (#26481921)
asking a Tecmo guy about Madden, that's like asking a vegetarian how to cook a great cheeseburger :)

all I can say is that the Tecmo community has been chipping away for 30 years at learning all the internals without any source code or reference, gaining knowledge little by little, and fortunately, sharing it so people can build upon other people's discoveries. Don't know if a similar resource exists for Madden.

Re:How I make graphics for retro systems and retro-styled games by adamdusty on Tuesday March 16, 2021 @05:23PM (#26483186)
There is a madden modding community at footballidiot.com/forum

Might be the place to start. Madden 08 is the biggest target as far as I know, but someone there might be able to point you in the right direction.