Sega-Naomi

Well, it took me a while and there was some cursing involved but yesterday I tried building a naomi dualbios piggyback style and it fits!



I've tried it with a few carts with protruding eproms and also with my dimmboard and they all snap in there just like they're supposed to.







I will not build these on demand (unless I get irresistable offers) as they're an absolute b*tch to do but I'll probably make some in the future ( when I have forgotten about all the work I put into this one )



Big thanks to Tormod for helping me with the pinout.



I can get you the bioses but you have to bring out your own soldering iron



Has this been done before?

Nice!



Do you normally do a lot of hardware hacking?



I've been interested in hardware hacking on NAOMI for a while now... I've been thinking about looking into writing a PlayStation 2 USB driver to interface with the JVS IO Board.



The idea is because I badly want to put a SF3.3 kit up in one of my JVS cabs... but I can't be bothered to build (more) hacky biwiring by gutting old PS1 controllers.



Appearently JVS is a standard protocol... anyone know where docs on it are available?

Thanks, I thought there would be some more reactions on this though Myself I'm very happy with it, there's not much room under those carts I tell you. Also, no more bent pins or ruined eproms from switching 3 times a day.



I've done some hardware mods and I like doing it but I have less time nowadays. Also, they have to look good and be practical, I don't like messy hacks.



A ps2 usb driver would be pretty cool but why not just use a MGCD?

Well, simply because I love coding on PS2 and this sounds like a fun project :)



Also, because this would let me put my PS2 in the cabinet for my own homebrew development with zero special hardware, it would be really cool to have a truly "JVSised" PS2 sitting in the cab talking to it just like the NAOMI does. (In fact, I think there there is a PS2 based JVS arcade box which does just this via USB - quite cool!)



Plus, I can output native VGA 640x480 from the PS2 just like NAOMI does, so it would be a quite cool platform to do homebrew arcade dev with, and intergrate "properly".



Also, the cable I was talking about was this:

http://balthasar.neovanglist.net/PlaySt ... ACable.jpg

(Note it's even official :)



This only leaves the power connection, which is bog standard AC current.



Much nicer than a dodgy PS2->JAMMA then JAMMA->JVS solution I think... (And way more fun to work on :)



Also, I found the official JVS standard PDF, which includes the USB communications protocol:

http://www.jamma.or.jp/siryou/siryou02/JVST_VER3.pdf



I'm having a friend who knows Japanese look into translating it now... maybe I'll have to take a couple days vacation soon to look into this!



Also: Just realized that during the development phase I would probably write the first driver implimentations in FreeBSD for testing - This could be ported elsewhere and be quite cool for setting up MAME boxes or other PC-in-cab things so that you have an actual driver for the JVS interface and don't have to buy extra hardware or special jamma stuff.

You need to make more :smt006

RGP wrote:You need to make more :smt006

Agreed!!



By the way...that's VERY COOL!!!!!! Great job!!

ngt wrote:

RGP wrote:You need to make more :smt006

Agreed!!



By the way...that's VERY COOL!!!!!! Great job!!

What he said :smt007

Do what I do have multiple Naomi's with different BIOS in there.

I only got 1 game (SFZ3U) that users the Japanese bios only anyway, oh & course CVS2 & SFZ3U need the Japanese bios for the "C" pannel options :smt011

I'm thinking about letting this baby go and maybe produce one or two more. Hit me with offers if you are interested.