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Yesterday we (me and El_Isra) figured another tiny piece of this puzzle. Stay tunned!

In fact it wouldn't because each card dump is encrypted with per card keys. It will be useful after encryption is defeated so keep it safe for now. It's exactly because the encryption key is unique per card we don't know how to decrypt it and copying data from one card to another does not work.

I suggest you check the voltage the programmer supplies the chip on the 5v rail during programming. That is exactly the kind of 27C4096/27C400/27C4000 my programmer would not do (older type with larger die, more segments). I made an extra adapter that boosts 5v to 6.5v on the eprom socket, that...

I just said the programmer does not supply what the EPROM requires to program properly. Eproms that work with 5v rail: NEC / Hitachi / newer ST chips with high density such as 27C800, 27C160 or 27C320/322 Eproms that won't work: Almost everything else. Why these programmers don't bump the 5v...

The problem is simple: Cheap Chinese chip programmers don't raise the 5V supply line to 6.5v and a lot of EPROM brands do require this to program. For example older ST Micro EPROMs need 6.5V at the VCC rail during programming. Keep in mind that this issue of raising 5V rail (VCC) to 6.5V is a...

The rhythm of the music is defined by the timer on the sound chip which is part of the neo geo board. That is controlled by the Z80 which is also part of the neo geo board. The multi cart only provides the program for the z80 to run. I suggest you try the cartridge on at least one different MVS...

As I said privately to Darksoft on discord, this must have to do with the long traces that come from the CIF custom IC and go through the board up to the CN2 on the opposite side of the board.

That doesn't work because the flash you want to use is a 8bit part.

Ultra SIMMs use a new kind of flash chip which requires the latest BIOS for it to function.

The simms are flashable, they will hold whatever you install from the right CD. The two different ones that are close to the cart slot who keep program data. What is written to these two simms are what differ from one cart type to other.

Some games were rental or sample and therefore do not offer freeplay mode. Example, all Brazil games were (supposedly or so Japan Capcom wished them to be) rental and lack freeplay option and do display their digital coin counters when you press action buttons while on atract mode.

That is the point of the mentioned audio fix. The cps2multi introduced glitches on the PCM data being send to the A board. That's why it needed a modification. You asked what/where the sound was generated and I answered. It is generated on the A board with data from the ROMs.

it is on the A board, the problem with the multi is that one of the graphics buffers drains some current that causes the audio buffers to malfunction, the A board get feed glitched PCM data which is reproduced at the speakers. The fix solves that issue

No because it's a hardware problem.

DEX and CEX used different challenge keys because they wanted to make it so MC installed KELFs for DEX consoles not function on CEX consoles and MC installed KELFs for CEX not function on DEX console... But they still needed the same memory cards worked on both so it has a command to swap...

Even on the earliest CPS2 multi boards, the jumpers never had any effect to begin with. What the jumpers do is select the functionality of the PIN 32 between A20 (27C322) or byte (27C160). That does not affect the multi at all.

When I added the COH keys to PS3MCA, I noticed that the dongle does not even acknowledge this additional command (because it does not support two keysets like the normal retail memory card does) so it worked either way, the command has no effect on it. What the command does is tell the memory...

no perché il file boot.bin contiene dati KC/KBIT specifici della scheda dongle. E' quello di cui parlavo nel messaggio a cui hai risposto.

They do on the expansion port. The thing is, when they designed the Master System they just made the expansion port and the cart slot the same thing. The Japanese SMS had to keep the original cart slot design because it need to be retro compatible with SG-1000 stuff.

SEGA's SH2s have "extras" for 3D graphics calculations, CPS3 will not touch that I suppose. Besides that it's the same SH2 as all the other chips.