> > > Is the alternate 573 BIOS the one that doesn't check for the H8 MCU?
> >
> > Turns out it checks for a different H8 program.
>
> So this new BIOS won't work with the current driver?
> Also what does the H8 MCU even control, the inputs from JAMMA?
The H8 seems to be used as a bridge to JVS. It's no surprise they didn't bother with the H8 on some of these boards, JVS was only ever used for the (pretty rare) memory card slots.
I'm not convinced there is more than one H8 program, even though currently the 700b01 bios needs a different pre-canned response to be happy. It's more likely there is something missing with the emulation.
The naming of the bios chip is annoying, there are two different 700a01's. I've not bothered looking too closely at what the difference of those is.
I've not heard back from guru which bios is used on the board with no h8, supposedly he has one that works fine. It wouldn't surprise me if it's one of the existing ones. Either the h8 can be detected and we don't know how that works yet, or with the 700a01 bios you can fake the response so that it's happy with two pull up and two pull down resistors.
Edited by smf (11/24/13 12:41 AM)
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