What features an "ideal" MSX combo-cartridge should have?

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Par sdsnatcher73

Prophet (3413)

Portrait de sdsnatcher73

02-04-2022, 10:50

I don't know how GM2 S-RAM detection works, does it need the ROM? But yeah would be a nice option.

Par gdx

Enlighted (5600)

Portrait de gdx

02-04-2022, 11:07

This is explained here:
https://www.msx.org/wiki/ROM_mappers#Game_Master_2_.28Konami.29

And a cartridge Game Master 2 compatible has already been made.
https://www.msx.org/wiki/ESE_RC755

Par Pokun

Resident (50)

Portrait de Pokun

02-04-2022, 16:34

Don't forget other SRAM mapping used in some ROM-cartridges like Hydlide II.

Par sdsnatcher73

Prophet (3413)

Portrait de sdsnatcher73

02-04-2022, 17:37

gdx wrote:

This is explained here:
https://www.msx.org/wiki/ROM_mappers#Game_Master_2_.28Konami.29

And a cartridge Game Master 2 compatible has already been made.
https://www.msx.org/wiki/ESE_RC755

I don’t see any explanation how games detect GM2 S-RAM. Probably the ROM is needed for detection. Using FRAM is a nice idea, that would be a nice to have.

Par sdsnatcher73

Prophet (3413)

Portrait de sdsnatcher73

02-04-2022, 17:40

Pokun wrote:

Don't forget other SRAM mapping used in some ROM-cartridges like Hydlide II.

Yeah that would be a nice addition, especially if there was support so that SofaRun would be able to configure and use it.

Par sdsnatcher73

Prophet (3413)

Portrait de sdsnatcher73

02-04-2022, 17:49

Come to think of it, on the fly config changes would be a great feature, won’t work for everything obviously but let’s say you wanted to swap the FM with a second SCC for games that require it that would be great to do without a reboot (like hot swapping real carts but much more safe and controlled Wink)

Par Parn

Paladin (794)

Portrait de Parn

02-04-2022, 18:29

For me, GR8NET is the closest to a perfect combo cartridge. But some very desirable specs are:

  • SD card reader (no CF nonsense)
  • The full sound combo: MSX-MUSIC, MSX-AUDIO (with BIOS), SCC+, extra PSG
  • Dedicated stereo audio out
  • Stereo sound mixer with panning
  • 8MB memory for cartridge emulation (or more)
  • At least 2MB memory mapper expansion
  • Updateable from the MSX, no need for external tools or opening the cartridge
  • Online configuration where possible (like OCM)

Some cool extras:

  • Dual SD card reader
  • Other sound chips, like YM2151 and SN76489
  • Wi-Fi

I personally don't think it makes much sense adding in V9990 and OPL4. I think it would make the cartridge prohibitively expensive. All of the above can be implemented in a satisfactory way with FPGA and some easy to find and inexpensive support chips. I'm aware many of the above require a slot for themselves so it's probably impossible to configure all at the same time.

Par sdsnatcher73

Prophet (3413)

Portrait de sdsnatcher73

02-04-2022, 18:51

OPL4 can be added in the same FPGA (if the FPGA has enough capacity). V9990 does not have an FPGA implementation (yet), maybe after MSX3 release it does (but I agree it makes less sense and would complicate all too much).

Par Wierzbowsky

Guardian (3448)

Portrait de Wierzbowsky

07-04-2022, 01:52

Thanks for your feedback!

Par RvS

Expert (80)

Portrait de RvS

07-04-2022, 08:14

Hi, in my opinion, the carnivore2 comes pretty close already.
But if I could add a few features:
-sd card slot iso. CF
-usb port for file transfer/live debugging/firmware updates from pc

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