SBlueman

There is a rumor floating around out there that part of the reason that Tecmo Koei has been remaking the 1993 SNES version of Tecmo Super Bowl is in part due to them not being able to locate the original source code to the cult classic 1991 NES release of Tecmo Super Bowl.  Today I'm happy to report that a decompiled version by @bruddog has been released to Github, making the source code for the original game available to anyone with interest in digging into the secrets of the game.
 
For those unfamiliar, Nintendo Entertainment System games are written in 6502 assembly code which is then optimized into kilobyte sized files that a NES can execute. In some ways, trying to interpret them as a human is akin to taking a book run through a shredded and taping the paper back together shred by shred.  Per the release, this is "An exhaustive disassembly of the NES game Tecmo Super Bowl into a byte-for-byte re-build of the original game".  @bruddog has gone through the trouble of "every last instruction and memory location" while even guessing at unused code in the game.
 
Due to the licensed images and characters in the game you will need to secure your own copy of TSB in order to complete the data required to compile a new game.  This operation will also create a decompiled and commented source code. For most, the tools we have more modifying the current game will be adequate and this will simply be a curiosity. For others, this will be a way to more effectively create modifications without needing to tediously try and decipher source code.  Perhaps this will one day you'll see a new retro type game release that plays exactly like the old NES Tecmo Super Bowl.
 
You can find the release at https://github.com/bruddog/Tecmo_Super_Bowl_NES_Disassembly
You'll need to have a Windows machine or else bring your own version of a 6502 compiler to the party.
I've not only verified that this works but also that if you're having trouble it's because you haven't taken the time to fully read through the build instructions.

Hello all, 
 
Over a period of years I managed to reverse engineer the entire Tecmo Super Bowl game into 6502 assembly source code with every piece of code documented and every variable labeled. There was a potential project in the works with said code but that project looks all but dead now. Because of that I am targeting the 30 year anniversary of TSB as the date I will publicly post all of the reverse engineered source code. 
 
-Bruddog

Just in time for the Super Bowl, it's the end of season release of long time TSB modder @SBlueman.  This meticulous release comes in three flavors: Vanilla, Hard Type, and Hard Type-Road Team as player 2.
 
 
 
Don't let the 'Vanilla' moniker fool you as there is a laundry list of modification from the original game besides the roster updates. For instance, the touchback has been changed to the 25 yard line and the extra point attempt has been moved back to the 15 yard line.  There are logic changes like the computer taking less sacks or not kicking a FG too early towards the end of the half. Little things like the animation of the QB being changed as he dropped back...did you see it?  To quote Shawshank, " I mean, seriously, how often do you look at a man's shoes?"  Please click the above link to read through the list of 30 changes for yourself.
 

 
 
The Hard Type versions are for the "do you even lift, bro" Tecmo crowd as the famed Tecmo Juice gets turned up quickly and the CPU quarterback starts throwing at the receivers you're not covering.  Come get some.
 
You can find this in our download section or at http://sblueman.com