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Reverse engineering 161 in 1 cartridge to change Rom games

XtraSmiley said:
MV1C
MV-1A

And as a side note, @rewrite all in one cart does not work in that same MV1C, but does work in the MV-1A. I don't know why.
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As Vortex mentioned back in 2023, he suggests that the chips run closer to 3.3V than the 3V they run now. I replaced both power circuits with my own custom design as well as replaced all the caps on the 2 PCBs and added more caps around the FPGAs and some of the flash memory to reduce ripple. Some cart makers use the stock no name regulator that China slapped into these carts which could be the root cause of the difference you see.

Of course, the best solution would be to use voltage translators, but that would require a whole new PCB design and we're talk about SD cart solution prices now.

When you have a cart with FPGAs and more flash than all Neo Geo carts combined, you're going to stress the system and need to have enough amps to power it all; this is most noticeable with 5V AES consoles.
 
leonk said:
As Vortex mentioned back in 2023, he suggests that the chips run closer to 3.3V than the 3V they run now. I replaced both power circuits with my own custom design as well as replaced all the caps on the 2 PCBs and added more caps around the FPGAs and some of the flash memory to reduce ripple. Some cart makers use the stock no name regulator that China slapped into these carts which could be the root cause of the difference you see.

Of course, the best solution would be to use voltage translators, but that would require a whole new PCB design and we're talk about SD cart solution prices now.

When you have a cart with FPGAs and more flash than all Neo Geo carts combined, you're going to stress the system and need to have enough amps to power it all; this is most noticeable with 5V AES consoles.
Click to expand...
Just curious if you've published your updates anywhere for others to make their own?
 
XtraSmiley said:
Yes, def weird, but with NG hardware and this wonky hacked Chinese cart, I have no doubt shit is weird!

What BIOS does your MV1C have?
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Ive got Leon's modded UniBIOS 4 in there for the "hold b" reset option.

edit: I got my BIOS from Leon, not sure if he wrote the software changes in it just to be clear
 
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