Recent content by nauman

No stress from my end :) You have the core principles correct about the usage of 0x10FD81. The documentation is a bit confusing due to the fact that BIOS_SYSRET_STATUS is used for multiple and different types of loops in the BIOS. For simplicity you can assume it is correct (since the game...

Just a quick tip when reading this debug. If you see PC=Cxxxxx, that is, starting with a 'C', that is actually mapped to the Neo Geo memory map shown here So.. 'C' is equal "System ROM", which is the BIOS. If you saw a PC starting with a 0 you would know it is the P-ROM writing/reading, which is...

I really like your energy to learn more :) So.. i spent a few hours this morning analyzing the game and I can now be bold enough to promise that the issue can be resolved with a small patch. Tried to upload a gif showing this but my knowledge does not lay in video/uploading so you just have to...

We should maybe create another thread for this because it is an interesting topic! Was way too curious to not investigate this further (maybe for a reason :) ). You are not wrong with the BIOS_SYSRET_STATUS value, although it does not seem to be the main cause of the issue with Metal Slug /...

the kickstarter page says this: sounds like they teamed up with others to port the game to different plattforms :)

I would let it soak in white vinegar for a few minutes, use a rubber band and wriggle the screw both ways without strong turns. Good luck :)

Good job! And hurray for another working board!

There are measurements for a Neo Geo MVS-4-25 from Jakobud. Except from the marquee, everything else should give you a close enough feel. https://archive.org/details/Jakobud_Arcade_Cab_Plans https://jakobud.com/cabinetPlans.html Very unclear license so use wisely :)

I would recommend starting to examine the pins around the neo-zmc2. Had pretty much the same issue where one pin was not giving a correct output, which showed up as a solid line in sprites. Also had this on consoles where cartridge slot was dirty, loose and in general in poor shape, so testing...

Well, hello everyone! Got a weird urge a few years back to revive childhood memories with the Neo Geo from the arcade halls. Since the prices are so amazingly cheap (not really :p) I ended up learning more about electronics while fixing broken units I could afford, than actual playing the games...