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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.

Or have two carts.

Who mentioned UltraSIMMS anywhere ? I sure didn't, did I? The Ultrabios work with regular simms too, you know? The only "specialty" on Ultrabios is that it has the IDs for the UltraSIMM flash chips on it so those can work.

The ideal thing for Ultrabios users is have two carts. One CD and one NO CD. Both of either encrypted SH2 or standard SH2. and then use the correct disc for the pair of carts. Edit if someone could hack a larger flash on it and make it banked to have two BIOSes it would be incredible.

That's an unused feature. It's a 2KB non volatile FERAM memory chip not a single game uses.

Smells like you have the wrong stuff written to the simms... I.E.: You have data for normal SH-2 CPU flashed on the simms but your cartridge has a CAPCOM encrypted SH2 or the opposite, same result...

Mega Drive/Genesis SEGA had Yamaha remove all of the TMS9918/28 video modes from the MD video chip to not need to pay royalties to Texas Instruments so it does not have any means of producing coleco video as it lacks the required video modes. This also means no SG-1000 games of course.