As far as the custom commands go, we can just use a different sync byte to prevent collisions with custom commands from games. So for example, all legitimate JVS packets use 0xE0, we could use 0xA0 and then continue to use the same packet structure.
With regards to the commands you'd want to send for profile switching, sure, anything outside of the standard JVS commands could potentially be used. When I was referring to "custom" commands in my earlier post, I was talking about the potential for a game and dedicated I/O to have custom commands within the JVS spec.
Per the version 3 manual I have:
メーカーユニークコマンド
Google translates this to:
Manufacturer unique command
They can be anywhere from 0x60 to 0x7F. I'm curious to know if TTX games commonly utilize any of these unique commands when they see a specific Taito I/O. If so, then what are they for outside of normal digital inputs, outputs and analog inputs which I would expect fall within the normal commands?
I haven't done any analysis, but I believe NAMCO games will issue NAMCO specific commands to their I/Os when they see one present. I theorize that Mario Kart Arcade GP 1 and 2 use these commands since the camera is attached to 3 pins on the NAMCO I/O. However in the case of the NAMCO games I've come across they don't require a NAMCO I/O, so they'll still work with others without accommodations for the unique commands.
my sega jamma - jvs needed a couple of resistors soldering on it to spoof the coin meter for it to work properly - same issue with some of the aw conversions.
I read somewhere, a long time ago, that the Sega Type 1 I/O wasn't compatible with the TTX so I never bothered to test it out until recently.
At first, the game recognized the I/O board but not the inputs. Then I read a tip from andygeezer on AO:
tried it with SSFIV and it worked!
These comments are making me think maybe the TTX games aren't that strict? Some Sega games require coin meters, and I think it's par for the course to have that jumper wired for inputs to work on Sega Type 1 I/Os. The nice thing is that my MEGA JVS doesn't need any of that. It tells the games that everything is ok with regards to coins and there's no check for a jumper to activate inputs.
So this leads me to question what's required on the driving games? Is it that the standard Taito I/O just lacks features these games require? In the restrictive games I've run into, it has been solely restricted to features, which is a reply to a separate command than the board ID. The games don't care what I call the board, but they care what feature it claims to have.
I imagine those interested could adapt the wiring as needed. Or if your solution is open source, maybe someone could do a run of PCBs for different setups.
I'm not planning to release the board as open source, but I'd certainly be willing to work with you or someone else on putting together TTX-specific revision if there's demand. Otherwise a wiring adapter is probably the way to go.
However, if we're talking people trying to boot up driving games in their fighting cabs, what's the purpose? I'd think you'd be better off working with
@invzim and his I/O project where you could use USB controllers. My I/O is pretty much designed for in-cabinet use.
in my Vewlix
