Recently, Revenged2 apparently stumbled across a credit warp glitch in Zool on the SMS while livestreaming.
https://clips.twitch.tv/TawdryYawningLyrebirdRickroll
I've gone ahead and reproduced this glitch in a very unoptimized run. The BK2, tasproject, and a txt file with basic data are avaiable in my google drive.
https://drive.google.com/drive/folders/1_uR6CAXUP5kUElVhb-Xqgu1WlaQ8SRLu?usp=sharing
A good frame to start watching from is probably around 90 000. (That's 90k).
Late edit (8 July): I finally uploaded this to youtube.
https://youtu.be/kLvRqYGwUaQ ... if you want to skip to the glitch itself, try around 25:00 or so.
I'm putting this here because there may be people interested in analyzing this for use in a TAS video. I have no plans to make use of it myself. This is literally the extent of my work, although if I've botched the video then please don't hesitate to ask me to fix it. This is what probably amounts to a pathetic attempt to give something back to the community. I don't even have the ability to read the code in the debugger and analyze the bug; someone else will have to do that.
If you make use of this and would like to credit me, please credit me for the effort in making a recording that could be analyzed.
Follows the raw data for the things needed to put this together.
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Bizhawk version:
2.3.0 (x64)
SMS Firmware (Bizhawk firmware manager copy/paste):
SMS Export SMS Bios (USA/Export) SMS BIOS 1.3 (USA, Europe) US-European SMS BIOS V1.3 (UE) [f1].sms 8192 sha1:C315672807D8DDB8D91443729405C766DD95CAE7
ROM (GoodSMS):
Zool (E) [!].sms